In my opinion the insert menu in the toolbar is hard to use, and should be improved, though I don't really have good ideas about how to do so.
The main problem is, that (once you expand it) it is a really long list with no obvious order you have to really search for the tool you want to use. Just today I wanted to insert a code block on Wikipedia. Though I knew the tool must be there somewhere, I had to go through the list twice, before I spotted it. Here on mw.org the list is even longer than my screen, showing a scrollbar (though only the "Fewer" item is not visible without scrolling). Just wait some time and there will probably be even more extensions adding tools to that list.
Just some more or less random thoughts:
- The order of the tools should be reconsidered. For example, why is "Hieroglyphs" (something most users will never use) the fifth item, coming before tools that are used more often?
- Could the order and selection of the tools depend on the user and the context? For example, record how often a user uses a specific tool and provide his favourites more prominently. Or make it depend on the context: On a page with many formulae you are more likely to add another formula than on other pages.
- Would a hierarchical menu (once these are possible, which currently isn't the case) improve the usability? It would make the list shorter, but on the other hand this could force you to search several submenus, making it even worse.
- Are there other users with better ideas how to improve the insert menu?