Thanks to all of your guys, i do understand your criticism. I will try to find out more about this player, which has so many good properties, as i found out already. But sometimes it is hard to grasp all the features right, and, as the user urfausto stated, it might be because of (some) poor translations (i'm using the german version) or very short or missing descriptions. One example, i had ticked the "auto organise" button, thinking, Musicbee would do stuff just internally. I have my music folders organised into ten style categories, like "Reggae", "Jazz", "Electro" etc.
Last night i found dozens of new folders in that same directory, which MB has put there randomly, or through some kind of system, i don't understand yet. First i was shocked to find my whole music drive changed, but luckily MB didn't alter my ten main categories, so i only had to move those maybe 30-40 new folders elsewhere (until i am sure, they weren't moved from those original folders, what would make deleting them a big mistake. But as it seems, those are only copies). Anyway, i like the fact, that i can mix MP3 and MP4 and export playlists, which my previous player couldn't handle, and to have the information and in many cases even the lyrics at hand, the look, and some other small details. So bottom line, i plan to stick to Musicbee as my main music player, and to read more in the wiki about its capabilities.