In the desktop world, there is virtually no end to the number of music and video managers out there. MediaMonkey was one of the not-quite-legendary-but-still-popular options that excelled for its ability to change tags and run custom scripts. Now, users of this program can sync to their phones without going through an extra program with the MediaMonkey for Android beta.
The beta APK is currently available over on Reddit, and obviously comes with some disclaimers, and you'll have to install the newest version of the Windows app to use it. Once you've done that, though, there a host of features already available:
Content Navigation for Music, Audiobooks, Podcasts, Video, ...
Navigation by various subcategories (e.g. by Artist, Album, Composer, Genre, Playlist
Playback (relies on native Android codecs). Supports replay gain, bookmarks, quickshuffle.
UPnP/DLNA client with download manager
Contextual functions for single/multiple files (e.g. play, queue, playlist management, delete, use as ringtone, share, edit)
Playlist management with hierarchy
Now Playing views: Individual (swipeable UI for in-car use) / Tracklist
Wireless sync with MediaMonkey for Windows
It might not be for everyone, but folks who love to have a high degree of control over their local music collection should take a look.