Update of the update (2008-05-01): Well shit, the upgrade isn't perfect. Today I came back from lunch to a laptop that didn't wake, but the delay did seem shorter. I wish this was fixed already.
Update (2008-04-27): Well I went ahead and did the upgrade and as of yet, no wake-from-sleep issues, so maybe, just maybe, this is the fix I've been wanting.
I see Apple has a released a firmware update for the MacBook Pro but the notes don't say what it fixes. According to some articles it includes a fix to the 1.5.0 version (which I never even saw) that introduced some "blank screen" problems. I've been having the won't-wake-from-sleep issues numerous others have reported but the "blank screen" issue sounds even worse so I'm waiting on this update.