We use keyboard tracks for a few songs; our drummer is our keys player, and for parts that have both drums and keys.... we use the keyboard tracks. He has a sampler/sequencer/mixer thing configured to give him click and keyboards for those songs, while the house gets just the keys. We also have speech clips from various movies in some of our songs, and those are triggered by the guitar player through his loop station.
In my previous band, we had one song that that had an organ section which I recorded in the studio, but to play live, I put a wav of each chord playing for a few measures in a separate "sample bay" in a JamMan Solo XT. When then I tap danced like mad to make them happen live.
I'm honestly kinda surprised at how polarizing of a concept this is. How is this any different than having stage lights? You're adding to the performance.