This can't be such an uncommon feature. I have a work laptop and a home computer. All my bookmarks on the work laptop are work-related, but sometimes I use it to browse news, articles, etc.
I don't want to mix up my work and non-work bookmarks, especially because I need to have the work bookmarks organized in a special way for quick access. But I DO want to see the tabs I have open on the work laptop from my home computer, iPad or iPhone so that I can continue browsing.
Thus, the BIG problem is this: Once done working, whether chatting with colleagues or browsing by myself, I open up a bunch of tabs/pages that I'd like to read. When it's time to leave, I go home and I either have to search to find all the same pages I was looking for, which is just a waste of time. I can email them to myself every day, which is another hassle and I might forget. Or I just end up using my work laptop to continue browsing, trying to find a moment when I don't have ANY tabs open to switch to my MUCH BETTER home computer. Yet, that moment usually never comes.
I've been looking for a nice solution for a while. If Apple just had more fine-grained control over iCloud, it would be better. An "Options..." button like they currently have for Photos, for Safari to chose what to sync. The same for Documents & Data, chose which apps to sync. For example, Mail, Pages, Numbers, Text Edit or Other Data. I don't want Mail to be sync'ed, but all the others yes. However, because I don't have that option, I have to disable Documents & Data completely for this computer.
Sad, really. But it's not the first time when "simplicity" of the design has gone in the way of functionality and usability.