Thanks for posting that shortcut info from the Unofficial Guide...I was looking for mine but couldn't find it!
But yes, that is definitely the fastest way to Splash. We used it in 2003 and were riders of the day with no problem! We especially beat the crowd coming from Liberty Square/Frontierland by a MILE.
Good luck on being riders of the day, dementia! It's awesome--we were grinning for the rest of the day!