I only used indicators during one summer, and only because I was curious. They're annoying to me, and I just watch my line/leader for any pauses to indicate a strike. Some strikes on a nymph are quite vicious, so no bobbers are needed there. Others can be much more subtle, but I still catch fish without looking tacky.
Streams are easier than lake IMO, as there's no current to drift a line there. You should still be able to see the take by watching the line, or work your nymph for better coverage and strike detection.