I think it's pretty interesting how people like to throw these lyrics back in MP's face. Kev was in the band for 3 albums, Mike put in 20+ years and helped get this band to where it is right now. He also didn't want this to be a permanent thing.
Nor, however, did he prioritise the band above gallivating around and doing other things. He chose new pastures over Dream Theater, which - pushed into it or no - he had to do. He was given a choice between "Dream Theater" and "something else," and in lieu of being able to have his cake
and eat it (which incidentally is not a phrase that makes a lick of sense, and should probably be phased out), he went for "something else."
Kevin, too, was in the band for a decade, and had been a member of it for its entire life when they wrote Raise the Knife. It's not like he hadn't invested a lot into it either. I think the situations are pretty closely comparable.