Well...I'm not into arrangers, but if I can put forth my two cents worth..here it is.
Our band plays regularly at locals pubs and bars. Generally a 3 1/2 to 4 hr. night. We try to keep the audience, and in particular, the dancers happy by not having that awkward moment between songs, so our nights usually consist of bam bam bam, song after song with the longest break between being maybe 5 seconds max. As for settings, I can usually set up my T3 in advance, although a few numbers require me to switch on the fly in the middle, but this isn't too often.
As to the next obvious question....why a T3? 'Cos it's dependable, has great versatility, & portability, and obviously, it's not an arranger, so as a keyboard player, I actually have to do the playing, instead of having a machine do it for me.

Uh Oh...I think I might have hit a nerve....I better go now...

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...shboom