I highly recommend that you make use of RubyMine's feature to pin tabs.

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When you pin all "important" files, you can follow method definitions, wildly open files from search results and have a ton of open tabs -- without the problem of finding the stuff you were working on before.

Guide

1. Pin the tabs of files that are currently in the focus of your work (important models, specs, etc):
   • Right-click a tab and select "Pin tab"
   • Or use a shortcut (see below)
2. Work as usual.
3. Once you opened other tabs because you searched for something and are done with it:
   • Right-click a tab and select "Close all" (used to be "Close all but pinned")
   • Or use a shortcut (see below)
4. Profit!

Shortcuts

I strongly suggest you use keyboard shortcuts. Assign "Pin active tab" and "Close all" from "Keymap" under the settings dialog (Ctrl+Alt+S).

Works well for me: Ctrl+“+” to pin and Ctrl+Alt+“-” to close.