No multiple planes in MOTW. Sorry.
I kind of miss it too. I thought it was one of the things that made FF different from other fighters. It didn't DRASTICALLY alter the gameplay, but it was a lot of fun to have in there nonetheless, sort of a tweaked aspect that helped define the series as something different from other fighters. Some hardcore KOF players don't understand why us FF fans like multi-plane, but that's just because they don't 'get it'.
But don't let the absence of multi-plane change your decision. MOTW is still a GREAT fighter, and I think you'd be making a big mistake if you changed your mind.