I use some 'barely there' reverb for everything most of the time (ie rhythm and leads .I almost never play clean.) preferably from the amp if it has it. Occasionally I use "barely there" delay (in the loop) as well.
I use this much reverb, always on. I have two settings, room/short tail and hall/long tail for different tempo songs, e.g. mid-tempo vs ballad (there's a 'tap favorite' built into the pedal to switch between them.)
Reverb always on for me. I prefer the Fender spring reverb tones--feel that a little goes a long way. I feel that spring reverb plays best with both clean and driven tones.
If I want a lot of reverb, I will go with a hall style reverb but only use that with cleans (usually for an acoustic doing background playing.)