I'm not sure that tracks - the most high profile renaming of an existing ride is R75, and then there were a few changes when CF took over due to losing Paramount-controlled/negotiated licenses such as Lara Croft, Outer Limits, Italian Job, and Hannah-Barbera.
However, I don't think these changes did much other than rename existing attractions - certainly not change much of the perception of the park and it's history.
Well, the list goes:
Thunder Raceway --> Gran Prix Raceway
Ricochet --> Apple Zapple
Rebel Yell --> Racer 75
Triple Spin --> Bad Apple
Drop Zone: Stunt Tower --> Drop Tower: Scream Zone
Italian Job Turbo Coaster --> Backlot Stunt Coaster
Avalanche --> Reptilian
Scrambler --> Arachnidia
Outer Limits: Flight of Fear --> Flight of Fear
Scooby Doo and the Haunted Mansion --> Boo Blasters on Boo Hill
Red Baron (several previous names) --> Snoopy Vs. Red Baron
Road Rally (several previous names) --> Peanuts Road Rally
Junior Turnpike --> Peanuts Turnpike (originally opened as Top Cat's Turnpike)
Boulder Bumpers --> Lucy's Crabbie Cabbies
Ghoster Coaster --> Woodstock Express (originally opened as Scooby Doo)
Taxi Jam --> Great Pumpkin Coaster
Rugrats Toonpike --> Joe Cool's Driving School
Nickelodeon Space Surfer --> Flying Ace
Is there another park with more of its current rides having been renamed?
On the other hand, list of current rides that never got renamed:
Eiffel Tower
Dominator
Berserker
Shenandoah Lumber Company
White Water Canyon
Blue Ridge Tollway
Flying Eagles
Grizzly
Xtreme Skyflyer
Carousel
Windseeker
Twisted Timbers
Americana
Delirium
Wave Swinger
Dodgem
Tumbili
Anaconda
Intimidator 305
Lucy's Tugboat
Flying Ace Balloon Race
Linus Launcher
Snoopy's Space Buggies
Charlie Brown's Wind Up
Snoopy's Junction
Woodstock's Whirlybirds
Snoopy's Rocket Express
Sally's Sea Plane
Kite Eating Tree
Peanuts 500