I just noticed this posting, so sorry for being a little tardy as I did notice the change. I have two reasons why I actually like the sidebar always there:
1) I am inside a folder and noticing all the great work, when I find something or someone I would like to check more into. The left sidebar allows for a quick look into what is there and sometimes I will see something about that thing or person. Nice way to navigate on the spur of the moment. I have a wide screen, so real estate is not that much of an issue.
2) I do not know if it is me or something else, but I really like the Log On always available as I have many times been "dropped" when adding comments, posting images, etc. Even if I am not dropped, I sometimes browse a little if I am in a hurry, but then decide to log in. I realize on the top right too, but to me more convenient on the side bar. Do you know if others are having problems with being dropped too? I have had several times where I add some comments or download an image only to have lost it. I have gotten used to now saving the comments first before posting.
Thanks for doing this and trying different things.....Richard