I went to DL on both Friday (opening day) and the following Sunday. Here's my brief report.
I arrived at the Harbor entrance at around 6:00 on Friday morning. There were several hundred people ahead of me. In fact, I was told that some people had been there since 3:00 a..m. Despite the length of the line, it moved quickly. Once through all three security checkpoints, we were placed in a queue on the tram road. At that time, we were allowed access the the bathrooms. On Sunday I arrived at about 6:15 and the line was easily half as long as it had been on Friday. Presumably more people wanted to be there on opening day.
We moved to the park gates after about twenty minutes and on Friday were admitted nearly an hour early (only 25 mins early on Sunday)

. Main Street was lined with CMs on both sides welcoming us back, which was nice. At the head of MS I met Josh D'Amaro, who's the chairman of Disney parks, as many of you know. That was a nice surprise. Also: on both days I noticed that the ratio of guests in line at DL vs. DCA was something like 10:1.
I went immediately, of course, to PP. The line was only about seven minutes long. As others have pointed out several times, Snow White seems to be the bigger draw these days and I rode it both on Friday and Sunday. Both time the wait was about 25 minutes. I actively avoided watching any videos about the changes. I wanted to be completely surprised. And I was. I returned to PP at around 10:00 and it was still only about a five-minute wait. I've never seen anything like that in my entire time visiting DL.
Although crowds were among the lowest I've ever seen, lines for several attractions still meant a long wait. At one point POTC was about 30 minutes and HM was nearly an hour. I think that was more a function of slower loadings and fewer people per boats/Stretching Room.
In short, my big takeaway was that it felt strange to be back but to not see anyone I knew. As I said to a plaid towards the end of my visit on Friday, it was like being popular in high school, returning ten years later and not being recognized by a single person. I did bump into six CMs who did know me, however, and three greeted me by name, which was nice. Lower crowds also made the park feel vacant at times. For example, Sunday at around 11:00 I got in line at the SBUX on MS. I snapped a few pics of the street and it felt nearly empty. It was a strange feeling. There needs to be a good number of people at the park to elevate the excitement and to make it feel like an event. Going to DL with so few guests in attendance felt a little lonely -- almost felt like drinking alone (I don't drink but I can imagine the feeling ;-)).
On Friday, all BGs for ROTR were gone in about 20 seconds. I got one on Sunday -- #67 -- and made it on the ride at about 2:20.
A number of characters were out but, of course, social distance was maintained.
I'll go again this Sunday. In short, though, I don't think I'll resume weekly visits until things have returned more to normal. Buzz being closed was more of a downer than I expected. A plaid I spoke with on Friday said that she thought it's closure was due to COVID concerns rather an actual refurb. It's a "high-touch" attraction and someone must have made the call to err on the side of caution.
One other thing I noticed: I got a big buzz (pun intended) from being able to move quickly from one attraction to the other, pre-pandemic. That it, using SR and FPs made it a lot more fun to weave through crowds and not have to wait a long time for a ride. Toad, Dumbo, Space Mountain and others were virtual walk-ons early on both days. Without the thrill of feeling that I was actually accomplishing something, a lot of the fun was absent. I was reminded of what Tom Sawyer noted when he, Huck and Joe Harper ran away to Jackson's Island. Much of the fun of fishing and swimming was gone when there wasn't someone to tell you not to do it. Peter Pan isn't the most amazing ride I've ever been on. But it was always a thrill to rush for it on Sunday mornings and be among the first to board.
A few places -- Jolly Holiday, for example -- had cups of water set out on a table for the taking. It was nice not to have to wait in a line for a mere cup of water. It was also reassuring to see that Disney wanted to help guests stay hydrated.
Some pics:
