The fullness and especially bottom end will certainly inspire your playing but as you said the practical matter of moving a big system is something we all must deal with. When I had a trio and was using a drum machine, keyboards and bass pedals I sometimes would bring my 2 X 15" subwoofer. Whole new world.

A guy I mentioned in previous posts "Al Rondo" had a massive system but he didn't move. Played 6 nights a week in one place. When he went from his longtime gig at a big resort to a restaurant he was "just using" 8 JBL three way cabinets with 18" woofers in them and on top he had 8 high end stereo speakers for the 1 mic he had for guest singers. He really rocked the dinner crowd BIG SOUND !
If I ever got a stable gig again I would have a full range 15" cabinet facing me just for a monitor.
Looks like Capt. Russ wins the I got the most toys contest. Love to hear it someday.