I would say it is still worth it. We have used it before and stuff has happened that completely messed it up (trip to ER with dislocated elbow) but all in all it was still worth it. Unless it has changed since I used it last the plan will bold items that really need to be done at a certain time so it's pretty flexible. Or like the last poster said, just skip an attraction and catch back up.
Of course I really, really hate the standing around saying "what you wanna do, I dunno, what you wanna do" so Ridemax is worth the price to me just to avoid that.