I have been instructed from early on in my writing that I should not use 'was' because it is a passive verb.
Forget that "instruction". It is toxic nonsense.
What you shouldn't do is use passive constructions where active constructions would be stronger:
The hotel room was trashed by the rock band is not as good, in most contexts, as The rock band trashed the hotel room.
However, what if a sentence were to read: They walked into the room which was littered with decorations and assorted items.
But He served as the night manager at Denny's is not as good, in most contexts, as He was the night manager at Denny's.
He was running late?
What's wrong with 'was'?
He was late.
He arrived late.
They walked into the room littered with decorations...
Problem solved.
There are always other ways:
He worked at Denny's as the night manager.
My point? While there's nothing wrong with to-be verbs, per se, we shouldn't settle for the first impulse either. Always examine your sentences and see if you can do it better, and often you find that "was" may not be the best choice.
For instance you could write a bunch of strong sentences one after the other:
He walked into the room. Suzy punched him, then ran. The fridge broke. He walked to the bathroom to pee.
But there's no rhythm to that kind of writing, it's authoritative
He only waited long enough to visit the barber shop and find a pair of well-polished wingtip shoes. After Dai-Ma left for the factory, he put on his best shirt and slacks, pressed to crisp sophistication. He folded two ten-dollar bills, an advance he had wrestled out of Mr. Nam, in his new leather wallet. He even bought a hat, a gray fedora that reminded him of Humphrey Bogart.
He only waited long enough to visit the barber shop and find a pair of well-polished wingtip shoes. After Dai-Ma had left for the factory, he put on his best shirt and slacks, pressed to crisp sophistication. He folded two ten-dollar bills, an advance he had wrestled out of Mr. Nam, in his new leather wallet. He even bought a hat, a gray fedora that reminded him of Humphrey Bogart.
There definitely is rhythm to this. The difference between TLO's example and yours is elaboration. After each action in the quote, there is further description of the object, even an emotional response to the hat. This is where the rhythm comes from.
But, like I said upstream, focusing on switching every usage of passive voice to active, regardless of how it fits within context (always context, it seems), can detract from focusing on the importance of a cohesive story with good flow.
"There once lived a man in Nantucket" has the same rhythm as "there once was a man in Nantucket."
This has nothing to do with strong verb vs. weak verb. It has to do with pacing, sentence structures, etc. If walk, punch, break, and pee are the right words, why would you use anything else? What does it have to do with "was"? If "was" is the right word, then use it. If "walk" is the right word, then use it. But I fail to see why using "strong verbs" would be different than "weak verbs" when it comes to packing and rhythm.
Look at the following. No to-be verbs or "-ly" adverbs, but there is rhythm in the writing, I think:
Agreed. Look at the big picture and don't sweat the small stuff.
Not at all. When I do a search in my word processor, the found term turns up in the centre of the screen. I read at least the entire paragraph, sometimes the entire screen, before deciding if it needs fixing. Doing a search and challenge does not preclude taking context into result. At the same time, I often find other things that could be improved.I don't quite get doing a search for problematic terms anyway. Seems like it would be easier to leave them alone until you're rereading and revising, then just mark them with a red pen. That way, you can get an idea of the sentence flow and whether they're appropriate or a bit weak. If you're just jumping from "was" to "was" instantly without reading the lines in between, it's hard to see how well they fit into the flow.