of course no one can make up your mind for you. If you're used to renting a car, you might be uncomfy without one, unless you like trying new things.
I'm confused about one point, though. You say you don't like waiting for buses. Are you talking about DME or Disney transport? If you're ONLY talking about waiting for the bus to take you to WDW and waiting for the bus to take you back to MCO, it seems awfully expensive to rent a car just to avoid those two buses, especially since the bus back to MCO is scheduled, you don't have to wait and wonder when it will leave.
But if you don't like using Disney Transport to get to and from the parks, that's fine and dandy, but that has naothing to do with DME.
For the record, I love DME. I had great experiences in both directions, and I think it's a great idea. I felt like a VIP not having to handle my own luggage, let alone having to even THINK about it.
-- Eric