Personally, I would get really bored flying the same plane all the time, but thats just me. I have never understood folks "needing" to fly one partucilar plane to have fun. I fly every plane in the AH planeset with an equal level of mediocrity and I have no doubt I am a better overall pilot having significant time in all the various types, much better than had I stuck with just one. Since I fly nothing but the CT is wasnt hard, nor did it take very long, to get to a decent level of lethality in each one.
Sure I have favorites, like the 109F-4, the 190A-5, the P47-D11, the F4F-4 and the C202. You will rarely, if ever, see those planes in an MA type arena, which is really too bad and its their loss.