You're lucky. Other folks are missing phone calls due to the slow wake up sometimes.

Others are witnessing that the phone just isn't ringing and goes straight to voice mail.

Just because you've not witnessed any problems doesn't mean that they don't exist. There were a few other threads that have talked about this in the past.

Congrats on your Galaxy S. There's quite a few things you can do to expand your phone's performance. There's a lag fix, I'm using the EXT4 version, but EXT2 is even faster. The GPS fixes are forthcoming and the 2.2 Froyo firmware has "leaked" but I heard it was problematic in its current form. So steer clear.