I use Media Player Classic - Home Cinema, and haven't had any real complaints. Occasionally a broken file doesn't play right and I play it in VLC, but I don't like the way VLC does a few things. In particular, I like being able to pause by clicking anywhere on the player with MPC. But overall, there isn't a lot of difference between most of them.
For music, I have been using Media Monkey for years, and even bought their lifetime license. I know it has a bigger footprint and all that jazz, but I can't remember the last time my computer was so shitty that it mattered. I love the way it organizes things, and the way I can easily tag things all at once. I'm sure plenty of other players have similar functionality, but as you said, I know how to navigate around MM and find using anything else difficult. The biggest thing I like about it, however, is that it will sync to my iPod without going through iTunes, and will even convert all of my FLAC files to whatever quality mp3 I put in the settings. And if I want, it will do that all automatically whenever I plug my iPod in. Not having to use iTunes is worth hundreds of dollars to me alone, so buying the legit version of MM was easy.