I just went through Plex and cleaned up my media library, and Plex does a few clever things to help with large collections, particularly series of things.

1. Collections. Basically you can take a series of movies (Like Harry Potter) and group it together into a collection, so the entire series will be under 1 tile in the grid or list view. You can name it something obvious like "Batman Arkham Trilogy." This would also help with cases of DLC items, so you could put Alan Wake and American Nightmare together, or F.E.A.R. and it's 2 DLCS (Or the whole series) together. Potentially collections inside collections, so games in a series with multiple standalone DLC's can be grouped together, like Far Cry 3 and Blood Dragon, Far Cry 4 and Primal, Far Cry 5 and ...Mars or whatever, all under a "Far Cry" series category.

2. Sort titles. This is common practice in media to skip words like "The" or "A" etc. Aside from placing games like "The Witcher" under "W" instead of T, you can also edit them to have games show in order of sequence when it's not just a numerical change. So in effect you can change the sort order of the Batman Arkham games so they show in chronological order... nevermind the fact that those in particular are already in alphabetical order.

3. Change synopsis. Helpful for custom games or if you just want to change it for whatever reason.

4. Summary view. I don't think it's as important, but Plex will show your media list in a "summary view" that has a smaller tile in a list format with the text synopsis. Just seems like it could be another good library view to show a bit more information than just a standard list view.

5. Multi-select. Would make tagging multiple games significantly faster instead of doing it one at a time.