I never put a verb on the 2buss not even when mastering. I tried once and it did work for me but it depends on the mix, what you're after in term of general color and the music style I guess...
i cant imagine a single style of music where i would put it on the 2buss over individual stems. but there are no rules when it comes to mixing so if it works it works i guess.
Tiny amounts of verb on the master bus can help "glue" things a bit together but I never use it personally. As always, try and see what it's like. It's good if it sounds good.
You should rename the band from ""Experimental Rock Like Tool and Devin Townsend" to ""Experimental Rock with 2% or Less Room Verb". or E.R.W.T.P.O.L.R.V for short. It will be easier for impatient fans to call out at gigs.