Plugins in mu-plugins folder are not loaded

Does WordPress only loads plugins which are just single files in
mu-plugins?

No, they do not need to be single files but you cannot use plugins in their own subfolders as in the standard plugins/ folder.

The main plugin file (one with the specified plugin header info) has to be right there in mu-plugins/. Other files can be put in a subfolder and referenced from there.

I used it with my own plugins. I’ve never tried moving any robust plugin in there.

Also note that not all plugins are must-use-compatible
see http://codex.wordpress.org/Must_Use_Plugins#Caveats

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