Good article about the old arms race and the desperate search for that USP
I feel comfortable qualifying that as a "non-major" attraction, but, well, it exists.
@AnonMouse: Sure, the rides are inanimate objects, but the stories behind the rides often feature human (or in this came, human-like) characters. Indiana Jones: The Temple of the Forbidden Eye is certainly an "it," but it's about a male hero saving our tails.
As for Six Flags, Six Flags New England has Catwoman's Whip, a family coaster that was formerly Poison Ivy's Twisted Train. Both are female villains from Batman. So female themed coasters and rides are indeed more rare, but they do definitely exist.
Then there's Cedar Point, where the fanboys give the coasters pet names like Maggie and Millie :)
The Intimidator coasters are a good point, though -- I had forgotten they were named after Earnhardt.
As far as coasters being "she's" -- while I get where you're coming from, referring to inanimate objects as "she's" does more harm towards women than good because it reinforces the "women are objects" trope; not to mention that these objects are predominantly controlled by men.