I used my Irfan View tip to save the screen to disk to measure load times. Not precise, but maybe accurate to the nearest second. My system is a 1Ghz AMD Athlon. I already have the splash screen turned off.
Cold boot 15 seconds Warm boot 4 seconds
A cold boot means the first time Adobe Reader is loaded without any files, a warm boot means the second time it is run, also without any files.
Cold boot 10 seconds Warm boot 3 seconds
Thanks to PSF for the program to choose which plugins to load, it seems like a neater solution.