The more state I can leave up on my desktop, the better.
If there were better management within the browser -- non-visible tabs were eventually unloaded, with any page-state (forms data, etc.) saved -- then you wouldn't have the memory bloat problems that occur.
The thing is that it's a very large virtual workspace to spread things out over. So long as it's organized, it's really useful.
Look to movies especially of researchers in the 1970s or 1980s who'd spread clippings and papers over all horizontal surfaces in an office, tape/pin them to a wall, etc. You want to be able to scan quickly through the space at eye-speed, not have to dig into files / organizers / storage / regenerate the information every time you want to look at it.
It's why you'd rather have a large monitor -- you can strew windows over it and see more, rather than have to manage windows and go through them repeatedly.
For those of us who write software being able to discretely switch to a certain doc with ctrl-tab or ctrl/cmd-# is much quicker and efficient than navigating N times throughout the day just to reduce the # of tabs.
If I'm working on a Twilio web app I might refer to the Twilio docs, Ruby docs, twilio-ruby source, and some web related docs all throughout the day (HTML/JavaScript/CSS). Oh yeah, don't forget the JavaScript library docs. Why look them up each time you need them? Open them at the beginning, close when you're done work and that's that.
Your tab related OCD shouldn't enter into our workflow ;-)
I guess I just suck at my job.
On average I have 5 groups hacker news, reddit, slashdot, google reader, google searching and documentation group. When I work I frequently move around google searching and documentation group. In my leisure time I go to other group.
For example during working I need to search about some feature of a library. I open the top tab of the google searching group middle click on the link I am interested which opens in the new tab in the group. If some time later I need to see the page again just go to the google searching group and get the tab. This way I can easily organize my tabs.
We don't read the same things apparently.