bkmk - great post!
I discovered Letterboxd a few years ago. The basic free version is a very easy place to log films that you’ve watched, review them if you want, check other viewer reviews, and keep a watchlist of movies that somehow came to your attention that you might want to watch later. It also has a “where to watch” function on the landing page for each movie that I’ve found highly reliable and very useful for tracking down hard to find movies.
Letterboxd was recently sold and I hope the new owners don’t get greedy and degrade the free basic version. The long list of movie suggestions that I posted is simply taken from my Letterboxd “diary.” I can sort and search movies in a variety of ways, but the “diary” is simply a chronological listing of my viewing, based on the date I first logged a movie. I could never create such a list from memory. Letterboxd makes it easy and intuitive.