Changing names does a couple of unwanted things as well.
It breaks translations.
It makes old instructions in the wiki or on the forum obsolete.
I don't think it's a good idea to tidy them up unless they are clearly wrong.
But... this thread begins with this statement: Suggest a change that will make MC easier to use
I can't think of anything more important than a clear and consistent UI. Most apps that are deemed "hard to use" have a UI problem, and the menus are where that happens. If menus and terminology are inconsistent, unclear, confusing, users make mistakes, waste time, give up. That's the the opposite of "easier to use".
Certainly, trivial changes shouldn't be made, but a one-time thorough clean up of the inconsistent and confusing terms, menus, dialogs, would then require just a one-time edit of wiki aspects, then it's done. If tooltips or "i" button could be provided in menus, it would be the perfect place to state the old menu wording plus additional explanation. MC has undergone several architectural changes over the years (leaving behind certain visualizations and plug-ins, for instance, changing database structure, etc, etc) and even a name change (MJ to MC). Now might be the time to fix the user-interface side.
Perhaps those who used translated MC could comment, but likely it's not word-for-word. It might even be that some translated menus are already clearer than the english-language wording.