Shortcut to add faces following the loop when re-topology let's say I'm in the situation shown in the image here under:
I want to quick add edges/faces following the loop.
The method I'm using is "select 4 vertex" and add face with F. But this is quite long and I saw many 3d artists doing it very quickly (without the need of selecting vertexes all the time).

I'm also using F2 addon, but I don't think it can help in this context.
Yes, select only the yellow edge and press F and it will fill the whole face, and if you press F again it will go on with the following ones. It looks like you doesn't even need the F2 addon:



Or in Edge or Vertex Select mode, select the whole edge around and CtrlF > Grid Fill and it will fill the whole with a row of faces.