I played Bb horns as well as piano most of my early life consequently I always had to mentally transpose when working with a piano player. I did this almost automatically. I continued to do the mental transposing during the years I played piano bars in the LA/Hollywood area while going to college.
I played Organ for several years also but when keyboards came out with the transposer button, I quit making the effort. The timing was great because as you get older it seems to be harder to read music in one key and play it in another for a vocalist.
Bebop