I've been at this fiddling along for over 25 years now. I have gone thought the phase of one film one dev, then one film different dev and dilutions experiments, then multi films in a known developer, then varied developers. Now I am moving back to at least one type of developer with a given sort of film. For me now 35mm TMAX sees FX-37 1:3; Plus X gets shot at EI80, then developed in microdol X or d76, or if the light conditions suggest it, in PMK 1:2:100. All of my 120 or 4x5 usally sees harveys 777 or hc-110h.
For my 35mm woirk I am currently trying to work my way though all of the oddball films that have been bought or given to me, and get back to just hp5 and fp4+ There is pleasures in a single film and developer. Over time exotic developer experiments have taken away some of the old days simple pleasures.