ES File Explorer, once the only Android file manager you'd ever consider, has dropped in popularity since it became ad-supported -- invasively so. If you've finally decided to delete it and are in search of a substitute, a few exist that are more than capable of filling the role.
Our current recommendation is Solid Explorer, which you can grab from Google Play, however, if you want to explore all your options, Phandroid's Ashley King has compiled a list with several other choices including:
All have nice interfaces, with Total Commander sure to satisfy those who love the Midnight Commander / XtreeGold look.
The point is you don't have to put up with crappy apps (or great apps that do crappy things). With such a saturated market, you shouldn't be afraid to look for replacements, regardless of how well your favourites have served you in the past.