I don't know what resources are used by adding desktops, but I am certain it is a bigger deal than adding new browser tabs. I've used 8 desktops (across 2 monitors) for awhile. Adding a few more might really improve workflow.
Type of apps I'd like to always have open: Chrome / Finder / Terminal / Xcode / NetBeans / Excel / Word / Skype / MySql / iTunes
Something like having 2 word docs, 3 spreadsheets, and 3 browser instances (each using all the monitor space in their own desktops) would be very useful. Just a quick 3 finger swipe, and I'm ready to start thinking in a new context. I love it.
Maybe, OSX is robust enough, and 16-GB is so much, that I can keep opening desktops until the cows come home?
Best Answer
That is heavily dependent on the apps on each desktop and how you have them all configured (desktop picture, icons, etc.)
I would open up Activity monitor and start adding desktops and see where it takes you.