There was a time when there was nothing much as far as software for doing art and the computers were slow and super limited. At that time I got into Photoshop because it was the one that did the job and I'vce used it so long I use it without thinking.
I do mostly graphics work these days so photo manipulation is the thing I need and it bridges photo and painting suitably for my needs. So I exist artistically in this sort of in-between limbo where I don't need to do anything in particular but something new a lot just to keep it interesting for me.
I never got into Painter. Lots of people I know did. I didn't have a need for it. I tried Corel briefly but it didn't turn me on either. And I don't do a heck of a lot of painting and I have ArtRage for that.
I've had the high end professional (more or less) programs to use so I never needed to explore all the new little hacks and up and coming programs. All of them look fun. My one foray into supporting a software with any energy was ArtRage. And the irony is I don't paint much. But I wanted to see it make it. So I fully understand the consciousness of supporting software developers and I applaud you for going and checking all these alternate programs out.
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream