Gvfs does not start automatically


I activated the gvfs service by adding services.gnome3.gvfs.enable = true; to my configuration.nix.
I can see here ( https://github.com/NixOS/nixpkgs/blob/5816c45f28ef66d2641fc061ce104cf670fc2c7f/nixos/modules/services/desktops/gnome3/gvfs.nix ) that gvfs is being added to systemd, dbus and udev packages.

# ps aux | grep gvfs
root     25482  0.0  0.0 128996  2244 pts/1    S+   15:47   0:00 grep gvfs
# systemctl | grep gvfs
$ systemctl --user | grep gvfs
$ nix-store -qR /nix/var/nix/profiles/system | grep gvfs

So I am wondering:

  • Why it is not started automatically?
  • Why gvfs binaries are not being added to $PATH?

If I add an usb stick I would expect it to be mounted automatically, but nothing happens, even if I have pcmanfm-qt open.