I would happily do it again and if the drummers in my regular bands chose to play to a click it wouldn't bother me. It would spoil some songs which are supposed to gradually speed up but not ruin them so no biggie.
On the night in question the click was virtually buried in my mix so I missed cues which would have been useful, what wasn't useful was the extra instrumentation which we had in our ears but the audience didn't hear - obviously I play as a part of a whole, I play to the music of the band and having instruments which actually weren't there got in the way of that.
The spontaneity missing was the ability to stretch out passages of songs when people were enjoying themselves, everything had to run to the backing track. Also missing were those moments of musical magic which only come from a group of musicians improvising. It's an organic thing. that is what I said and what I meant about robotic. Not that there wasn't any feel. Clearly I never said that.
Anyway it was interesting. Not anything I would implement in my bands, I want those to be an organic whole, not separated individuals locked into a predetermined script. Although that has a lot to do with in ear monitors rather than the click track.