We actually had one with us too, because we had done some other travelling before getting to WDW. I got one through
Alamo so that I could check all our luggage at the resort on departure day, including the car seat. It was kind of extravaggant -- $50 -- basically to not have to check the car seat when we got to the airport at MCO. But this allowed us to stay at WDW until as late as possible and then to just walk to the gate with our boarding passes. Not sure I'd spend the money again, but we got a great deal on the car through Alamo, so I figured with the total cost of the vacation, $50 to spend an extra hour or so at the end of our vacation seemed worth it. Not sure I'd do it again.
All in all, I have to give Alamo high marks in all regards. We booked several months ago through costco travel. We got a really good rate -- $170 for the week. Shortly thereafter, July rates went crazy and rates were up to $500 for a week, or $400 using codes including some iffy ones. Jet Blue changed our flight so that we were arriving 2 hours earlier than expected. When I tried to change our reservation on line, I got the $500 rate. I called Alamo and they were great about changing the time for me on the phone and keeping the original rate.
Check in was a breeze. I check in using the Kiosk after pre-filling in my info. It took about 2 minutes. Walked out to the garage and showed my receipt and the woman brought me to a room filled with car seats to choose. I got a booster (standard cosco) and then walked another 50 feet to the row of full size cars and picked one. (They were all basically the same -- pretty good nothing spectacular. Clean, comfortable. The fullsize category with Hertz tends to give me a bigger car, but these were all fine.)
Soft sell at the booth when driving out to pre-purchase fuel, but all in all it was about 10 minutes. It could have been 5 if we hadn't goofed around checking out all 10 or 15 of the full size options. Return was a snap. Took a minute. My wife took the magical express (we had tagged our bags) and checked in while I went to the grocery. From gate to resort was about 90 minutes, and our room was ready. Easy as pie.