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There is a post on AndroidCentral giving the links to all the old KitKat apps that you can reinstall including the Gallery app. I installed the Gallery app back on my Nexus 4 and I got all my folders back.
 
All Chrome Tabs are now in the task list. You can't close Chrome with open tabs - you need to close all tabs. However, I like to close Crome and leave some tabs open.
This can be disabled.

Chrome > settings > merge tabs & apps > toggle off

Will function as before.
 
Oh, duck! I didn't notice that one!

But found one more annoyance:

All Chrome Tabs are now in the task list. You can't close Chrome with open tabs - you need to close all tabs. However, I like to close Crome and leave some tabs open.

Lollipop is a total disaster! Did Apple infiltrate the Android development team?

You can turn that off in settings. 'Merge Tabs and Apps'
 
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