I think in the old days of snail mail you were more likely to hear back because you could include a SASE. I read somewhere that they have interns send the SASEs back... With email, you just have to get an friendly editor who's feeling chatty.
I have gotten a few responses back, telling me the idea was good and they don't have the budget, or (worse) they're already working on the idea. I actually got a phone call from a staff reporter who wanted my opinion on story she was working on that was very similar to what I queried. That was a weird conversation! But I figured any contact with a magazine is good contact! (And I didn't want to be know as that crabby freelancer!)
Also, I have a decent relationship with an editor who's bought quite a few of my briefs now. He's told me that he only has time to look as fresh queries once a month, so I'm free to keep sending them in and don't be offended if he doesn't get back on each one. Every now and again I ask if he considered x,y, and z, and he'll let me know if they're deaders. Sometimes he'll come back with a 2 month old query and want it.
The spread sheet is definately a good idea. I try to keep one myself - then I can look back at it and see what ideas have worked, what hasn't. I update it when a query is sold, when I've turned in the article, then finally when I get paid. That last one is important, because sometimes you get paid on publication...and you don't want to forget about your check! (Which reminds me to go follow up on somebody.)