Here is what I would do. Use "Media Companion" to organize your movies. It can move into folders once they are loaded. Have it create the NFO file and download artwork, trailer, etc. that you want. You can also have it change watched status and a whole lot of other things. Then use the PLEX agent addon XBMCnfoMoviesImporter to import the movies back into your collection. It will use the information from the NFO to populate your library.
Media Companion. It's free, open source software that you can use to manage & organize Movies/TV Shows. I use MC to rename my movies and organize folders (prefer to group my movies by Movie Sets) and Sonarr for my TV series.
If you will continue to grow your Movies collection, try Radarr - that could help name movie files.
Grooming the folder structure and having some of the contents (artwork) locally will assit Kodi. I have found Media Companion helpful for this. https://sourceforge.net/projects/mediacompanion/
I use Media Companion developed by some guy from the Kodi forums. Since I run both Kodi (for internal viewing) and Plex (for external viewing) I have both of them set to only scrape local information only. Therefore my cache drive isn't getting choked up by having duplicate NFO/Poster/Artwork etc..etc.. All the movie information is in it's folder and Kodi / Plex just scrape it from there.
There is an ability to paste a URL into the movie/tv show section to grab a custom poster or, it scrapes TheTVDB and displays all the folders for that movie/tvshow from there and you can select which one you want individually (or just use the default)
It depends on whether you want specific episode names in your files or generic file names.
Do you want specific file names: Game of Thrones - 01x01 - Winter Is Coming or generic - Game of Thrones - 01x01 - Episode 1
If it's generic then you can use Bulk Rename Utility to quickly rename files.
But if you want episode names then you need a tool that scrapes the names.
I used epNamer till I switched over to using the file renamer in Media Companion. But I wouldn't recommend this if you don't like doing some extra steps. Sometimes I still have to rename the files in Bulk Rename Utility to get Media Companion to scrape files correctly.
I get your complaint about Filebot but I would add that if you want to do any kind of automation you need to know some basic scripting to get advanced tools to work.
BTW - The Renamer is no longer working because TVDB recently changed their backend sraping to Version 2 and the code would need to be updated. Looks like it's been abandoned.
I like Media Companion. FOSS on Sourceforge.
Grabs metadata, storing it in an NFO file, and can grab trailers as well. I run it periodically on my movie library to augment whatever metadata is missing or inaccurate. Or just to quickly make some changes to individual movies.
Once the metadata is in place, I use the Plex plug-in XBMCnfoMoviesImporter to scrape the NFO files and refresh the data in the Plex database.