My first cruise was in January via DU. We did concierge & added transportation. I found my TA very responsive to questions, but it was not a "full service" experience like I had imagined having a TA would be because I thought it would be door to door. It wasn't, but I was ultimately fine with that. I made my own flight arrangements and had to add on an additional hotel night's stay myself when we decided to add a day prior to our cruise. I sent my own midnite concierge email, but if I recall correctly, it's midnite eastern time, so no big deal coming from the west coast. We had to check ourselves in, but considering we have to put in sensitive info like passports, I don't think it's a bad thing.
As far as the check in process, I found the Disney website confusing when it came to the transportation/hotel stay part. I filled it out the best I could, but I guess Disney was equally confused by my response because they reached out to my TA who emailed me. I responded to her with the exact details, and it got sorted out. While I thought Disney could have done a lot better with communicating transportation details, we were pretty pleased with the service. We had private town cars to our hotel, back to the hotel post cruise, and to the airport. The bus portion from the hotel to the port was the most confusing bit, but again, it's not like we got left behind, so I guess it was fine!
Everything went well, and we're booked again with the same TA for a cruise next year. My main motivation is that OBC. She remains responsive to emails, but I don't expect to be as confused as I was the first time

This time we plan on doing port excursions, so that bit will be new...perhaps I can tack it onto the concierge email. It'll be fine, I'm sure.