How do I make *tree* list hidden files as well?

Use tree -a

$ man tree
-a     All files are printed.  By default tree does not print hidden files 
(those beginning with a dot `.').  
In no event does tree print the file system constructs 
`.' (current directory) and `..' (previous directory).

Also gvfs stuff are installed in many systems, you can use them too:

gvfs-tree -h