MS Bob did not work out, but the manager in charge of it did OK!
I have watched a video of Bumptop in use, and it seems to be a way of encouraging people to organise documents in piles, more like piles of paper. I prefer electronic documents because they organise themselves more (they do not change position when you take them out to read, you can sort by date or name, etc.) Making them more like a real desktop is a step backwards for productivity.
The changes I find useful tend to be things that make the GUI desktop LESS like a physical desktop: multiple desktops, desktops widgets, configurable panels, pinning windows, placing Windows always on top or bottom.
I no longer keep documents showing on the desktop background at all: the "Desktop" directory is just another directory, and all that shows on a desktop with no Windows on it are some useful widgets - CPU temp, moon phase (full moon days are public holidays here) and waste bin (to remind me to empty it occasionally).