I see almost every 4+ hour flight I am on 100% full. I have only had an empty middle seat 3 times all year, even a whole row.

One time when I was DGd, they agreed to block the middle seat next to me. Sadly, a GA come on board and county empties and then put someone in the middle seat next to me anyway.

I think the OP was very lucky to have a low load and get moved to an empty row.

I am curious how this was the OPs first time in E+ if they are a 1P.