Hic....................cup! Hey...Masoooon, I resemble (hic!) that remark...I think.
OK here's the answer for real:
when the arranger is "on" I am using left hand triggers...almost always. I have developed a style of play that usually voices the chords (right hand) so I can pluck out the melody if needed. I arpegiate a lot, and sort of "strum" the chords on the piano...more like the rhythmic motion that a guitar does. This is why I like a "lean, open" arrangement so there is room for me to play over top. I almost never use the FULL KB mode, except in rare cases that are difficult to play one handed arrangements. New York State Of Mind, Whiter Shade Of Pale are a few examples. And not always, either. They are a good example of the kind of two handed style I like to play.
My whole reason for using arrangers at all, has always been to have access to a drum machine. I still prefer to play my own bass lines as often as possible, but I admit - there are rooms that respond more to a fuller sound. This is when I incorporate the sequences and auto arrangements. In an intimate setting, or on classic jazz standard tunes by Gershwin or Porter - the piano, bass & drums sound is my favorite. It's easy on the ears and leaves lots of room for vocal interpretation. It also makes a "fresher" sound because tunes never sound like each other.
Using the arranger is both a blessing and a curse for me - sometimes it's wonderful, and other times is sooooo hokey that I can't stand it. I'd much rather hear a good "live" arrangement than a stock keyboard arranger anyway.
Is that the answer you wanted?