This is going to vary completely on how long it's been since the unit was remodeled and what kind of budget the hospital had. For example, a county hospital is going to have older equipment than a private hospital in most cases.
Here's some generalities: Most units have glass doors, so the nurses can see the monitors and the patients when they are not in the room. There is a curtain that can be pulled across the door for privacy. Cardiac monitors (as well as monitors for temp, central line pressures, etc. in newer units) would be monitored at bedside and at a central monitoring station. Many of the more progressive units had vinyl couch/beds near the window, but the lower budget or older units had vinyl recliners that made out into beds. Whether or not family is allowed to stay is usually either determined by hospital policy or at the discretion of the charge nurse. The wall (or post depending on the unit) behind the bed would have usually two oxygen ports, two suction ports and in some cases heliox. The IV pumps used in the 90's are still floating around. In ICU they are almost always triple channel. The newer pumps with the add-ons weren't available yet. Ventilators looked much the same, with the exception that the more recent models are somewhat smaller (just as noisy though).
Plastic was already pretty standard in the 90's. There are few things that still come in glass bottles, but that is because they are incompatible with plastic. (Like nitroglycerin drips.) The only thing that I can think of that has been changed out almost universally is the use of latex, due to the number of people developing allergies to it. Oh, and paper charts. Many hospitals are still converting to bedside computers for charting.
Basically, everything was a lot like it is today. My best advice would be to go to an older hospital in your area and ask for a quick tour. They will probably oblige you and even answer questions if they have the time.
ETA: Was the 90's really that long ago? I feel old.