I also played a bunch of different systems over the years.
The dark eye, shadowrun, degenesis, opus anima, vampire the dark ages, vampire the masquerade, twodice, call of Cthulhu, dungeon world, DnD, and a bunch of one-shots at meetups or conventions.
Probably forgetting some

Murch

Mh, I count at least a dozen groups with whom I have played for multiple sessions to years.

gaming

Dungeons & Dragons or other TTRPGs

smuglydawg

That is impressive, how many different groups or people have you been able to play with over all that time?