I would have said Cedar Point's Blue Streak, but it's 78 feet tall! THREE FEET TOO MUCH!!
With that said, my favorite woodie under 75 feet tall is Kennywood's Thunderbolt. I really like the layout, and I still think it's clever to add on to an old coaster and make it great. Plus all the drops down the cliffs provide great airtime!
I also have to mention Cornball Express because that coaster is better than most woodies double it size, and it's only 55 feet tall!