I think it's actually $75 for non-residents and $65 for Larimer County residents. I bought one last week and was charged $75. Plus, it doesn't look like the daily passes have gone up since last year -- still $6 on Mon-Th and $7 Fri-Sun.
Either way, it's definitely steep, but it's the best option if you go a lot (which I do). Last year, I wish I would've bought an annual pass. I probably went at least a dozen times and would've went a lot more if I didn't have to play $6-$7 each time. So far this year, I've already been to Horsetooth three times, so at this rate, it's looking like an OK investment.