I called the other day and was told that all airlines that fly into Orlando are participating. I told the CM I would be flying Southwest or Jet Blue and they told me I won't have to deal with my luggage at all. This have better be true,cause I could have booked Delta just as easily!!!!

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This is true, but I believe the OP was looking for a one-way trip going back to MCO. In that case, all airlines are not 'participating'. Yes, you can leave your baggage with Bell Services at your resort until it is time to leave for the airport...just like you can do now. Then, when it's time to board the DME bus to MCO, you take your luggage with you, on the bus. Then at the airport you check-in and check your baggage as usual. Those flying with the 'participating' airlines will be able to 'check-in' for their flight back at the resort! Their luggage will than be whisked away to the airport by a seperate truck, not the bus. Then when it's time to leave they will board the same bus as everyone else, but when they get to the airport they can go straight to security since they have already checked in and gotten their boarding passes back at the resort.
The time you will save will actually be at the airport. You don't have to stand in any check-in lines to get rid of your luggage. But, that really only saves you maybe 20 minutes tops, in my experience. And since we're all on the same bus, it shouldn't be any big deal. I just love being able to get rid of my bags and not have to lug them from the resort to the airport and get them checked.