Found a slightly better fix, I left the "Movie" plugin enabled and just unchecked the "Generate thumbnails" option in its configuration.
Strangely, thumbnails still show up for my .mov files (generated by the system maybe?), but I get no crashing, so no complaints.
I tried removing ".mov" from the list of supported formats in the "Movie" plugin configuration and leaving "Generate thumbnails" enabled, but it still crashed in that case.