I didn't get the sense that OP was complaining or criticizing at all. I got the sense that OP was just a bit whistful because there is a feeling that Disney works hard to give us where our hearts just swell with Disney wonder and for some it starts with seeing that bus that Disney shows pictures of in their advertising. Is it a big deal if it's a different bus? Of course not. Will it ruin a trip? Of course not. Will it be more than a blip on your radar? Again, of course not. Is it a little bit disappointing? Sure. I can appreciate that feeling.
OP, you need to realize that the transportation board isn't really the best place for discussions that involve sentiment. This board is VERY matter of fact, here are the rules and how things work. In general, that's very important for the transportation board because in some cases, if somebody has wrong information then their whole trip could be ruined. This really is more of a discussion suited for a community or strategy board since it really is more about that feeling of seeing that bus when you get to the front of the line.
Just to make it clear, I LOVE that feeling so I do totally get what you're saying. I'm fine with whatever bus is there and will always take advantage of DME and appreciate the service, but seeing the DME logo on the bus does just feel a little bit more special.