I have used the Mears shuttle to the S/D..and it actually worked pretty well. If your flight arrives, ontime, at 9:45, you should be at the S/D by 11:30ish. Yes, the shuttle can make a lot of stops. It all depends on what type vehicle you end up in. I was lucky enough to be put in a van...we made 3 stops before my Dolphin stop. If you end up on a full size bus, it could be more stops...but, really, no way of telling.
It took me just about 85 mins from checking in at the Mears podium to my resort.