I never thought of using the 'Pen Tool'..
I use the 'Quick Selection Tool'/'Magic Wand Tool':
1. Create a transparent canvas, same size as image
2. Import/drag the image into the transparent canvas
3. use the 'Quick Selection Tool' and create an outline around the Render (for HQ Renders/images.. the 'Magic Wand Tool' works even faster)
4. Press Delete and the BG is now Transparent
But i also like the Pen tool..