Thundergod, that sounds absolutely awful and exactly like how I would imagine feeling after riding it, so it's just totally on my skip list. I hate the free fall feeling on Splash (it just goes too long for me), but I absolutely love BTMR.
I'm too much of a wuss to even try California Screamin' because I refuse to ride anything that goes upside down. 
I'm heading to Anaheim with my best friend in about 20 days. She is EXTREMELY adventurous, and I've already told her that I will be plenty happy to sit and wait for her while she takes her life into her own hands. Or I will ride the Little Mermaid like seven times.