I certainly use the daylights out of my K1000 and I love it.
But...if you are looking for a quiet shutter...keep looking. Even with new mirror bumpers it sounds like a gunshot going off when it's quiet. Although some SLRs are quieter than others they are all a noisy breed.
If you want quiet, go with a leaf shutter 35mm. Even a Leica sounds noisy next to those cameras.