picasa is from google, its very nasty at indexing private data and slipping through lots of privacy issues. It most likely comes with aggressive auto update services as well that run with each windows start. So on a very personal side I probably wouldn't install it on a personal computer because I don't trust the software enough - always fearing that I cant proper uninstall it.
But on the other hand its really impressive performing - I tried it once and its really super fast (faster than anything you know from ms or windows) at finding indexed stuff. And if you are all about finding stuff you don't know where you archived it into then picasa might be the thing for you.
And yes acdsee since version 4 or 5 has become very buggy and bloated - its the same issue. Once you install it you get to much crap on your system like some consumer image editor (removing red eyes 'n stuff), internet services (like printing, galleries,...) well and lots of other shit no professional person would ever want to install on his computer.
There is also a ACDsee pro (version 2.0 now I guess) which is a relaunch of the ACDsee in a more dark theme with less consumer crap but still to bloated. Its sadly not anymore a quick image viewer
You can try however Xnview, its free does not need to be installed (can be simply extracted, though install packages for less experienced users are available as well). Xnview clones pretty well the early ACDsee behaviour - just some settings have to be tweaked at first (like the scroll wheel) but thats quickly changed.
I made you some screenshots how my configuration looks like:
it even supports image conversion in combination with scripts or image transformations (e.g resize, convert color tables,...) and some very neat batch renaming