Actually, that may be a reasonable travel time (although since the airport is about 20 miles from the WDW resort, I think that may be a bit optimistic), from the time the plane lands, you should figure on 70-90 minutes, so I would say the OP should arrive at POFQ about 11:30.
We just arrived at POFQ yesterday via the ME. We got very lucky. Our SW flight landed at 11:25 Once we found the ME (we went to the wrong side of the terminal), we were lucky enough to get right on a bus. The bus driver said it could be a 35-45 minute drive depending upon traffic. We were the third stop, after Key West and Saratoga Springs. I think we were in out room by 12:45.
I think it depends. When we went in Sept we waited about 10 for the bus then about another 5 min on the bus. We were the first stop. Took about 20-25 min to get there.
It solely depends on how busy it is, which is hard to predict. One time, from getting off the plane to walking into my room at POR was 90 minutes, and last trip it took about two hours by the time we got to the check-in line. I have found that weekend arrivals are MUCH busier at the Magical Express lines. We've had to wait through a couple of full buses before getting on one when arriving on the weekends.