The minimap's behavior on very long files feels inconsistent, due to the minimap being unwilling to scale down past a certain line height. On small files, it feels great, as it is a more useful alternative to just a scrollbar, but I never actually attempt to read text in the minimap, but just use it as a general shape of the code, which would be fine even with a much smaller scale.
I'm proposing an option like "minimap_show_all", which sacrifices minimap 'legibility' for a consistent feel between small and large file minimap behavior.