Last year we planned a trip around the later HS MM event as we could cancel the room reservation w/out penalty if we didn't get the MM admission. We ended up committing to airfare and adding an after-hours hard ticket party (MNNSHP) which meant we were going ... regardless of the MM outcome.
If we would have stayed with our original plan (room, 1 after hours ticked party, 1 after hours free party) we would have been just fine. Instead we added APs during the trip which sent us running to parks non-stop. Pretty exhausting ... but lots of fun.
Would I, in the future, build a trip around a MM event? Yes.
I've juggled the AP question around my brain both ways. Having the APs means that the trip won't be w/out parks ... but if you have the AP was MM really all that special? I find that I view MM as a greater perk when I wouldn't have had any access to that park w/out it. As such, I've given up my DL AP as I'm now enjoying alternating visits to DL/DCA through DVC's MM. Yeah.