I practiced with a metronoe for years as a kid taking piano lessons. I prefer playing with a drum machine as it's just not so dry, and BTW, we play with drummers !
In my case, while I had a fair 'innate' sense of time, after all that time with a metronome I was much better. On gigs I could tell instantly if we were dragging or rushing, for all the good it did me (none). I have pulled drummers around by the short and curlies at times.
I found that if the band as a whole let the time 'breathe' a little, it was exciting. If however, I'm on time and the drummer was behind, the keys were rushing, the pulse at the center was lost and it would never groove.
Jeff's idea is that a professional is a professional. Period, end of story. He's very opinionated, and somewhat angry. I admire big parts of the guy, but for some folks he takes all the fun out of it.
J o e y