I have F5 bound to :bn , it let me roll buffers, then I use :bd to remove a buffer. I open new files with :Explore.
It's a very rare use case for me to want to roll through all the open buffers.
Use Ctrl-6 (also referred to as Ctrl-^, C-6 or C-^) to swap between your current buffer and the "alternate" buffer, which is usually the last buffer you were looking at.
Use Ctrl-o and Ctrl-i to track up and down the "jump list". C-o is another good way to get back to the buffer you were just looking at, like C-6.