When playing a spellcaster, I've never felt that I had to "memorize the entire Player's Handbook" to cast spells. Any spellcaster only has a certain number of spells to choose from, so all you have to do is check out the one-line description of the spells, and read the longer description for the ones that sound interesting. There's plenty of spells in the PHB which I haven't read.
When spells get cast, you (the caster) don't have to know *exactly* what it does, either (although it makes the DM's job easier). In the campaigns I've been in, either the DM or the player almost always has to flip through the PHB to figure out exactly what the spell does. I've never heard a DM say "You don't know exactly what your spell does? YOUR CHARACTER DIES INSTANTLY!!!"
It does slow things down, but so does "Hey, how does my Feat work?"
Jason
When spells get cast, you (the caster) don't have to know *exactly* what it does, either (although it makes the DM's job easier). In the campaigns I've been in, either the DM or the player almost always has to flip through the PHB to figure out exactly what the spell does. I've never heard a DM say "You don't know exactly what your spell does? YOUR CHARACTER DIES INSTANTLY!!!"

It does slow things down, but so does "Hey, how does my Feat work?"

Jason