Yes I can imagine how going from multi-crew to SP would be interesting. I went in the usual direction and so have had the pleasant experience of finding that as your career progresses, you get paid more money to fly bigger aeroplanes that are in many ways easier to fly, or at least you have a lot more help at your disposal.
I don't mean to say that SP IFR is easy, just that's it's not as difficult as some make it out to be. There are some SP IFR pilots around who find the transition to multi crew very difficult and some just don't come up to scratch at all. It's a different set of skills.