I know the feeling, except I've been using Forza to take the edge off of those long, (and seemingly endless) multi-level caverns of Skyrim.
Although I am ashamed to say that I haven't yet taken the Cobra out for a proper race, only a quick test drive in the tuning area. It feels just slightly less insane to drive than its 1966 counterpart from GT5.
Edit: It is nice that you can sell the Cobra for 750,000 CR, unlike the the measly 100 CR you'd get by selling bonus cars achieved by leveling up. Not going to sell mine.