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Not for me.

Depends. Thick provisioned (conventional) LV snapshots take a hit. Thin provisioned LV snapshots take a much smaller hit, almost negligible.

I think its wise to have a healthy housekeeping policy if you're going to use lvm snapshots. Any point in time copy on write snapshot is going to cause performance degradation. However, it really depends on the volume and you can't speak universally for everything/everybody. For example if you have a drive with 100 files but only write to one of them. (for simplicity) The first time you rewrite those blocks are going to endure the hit for the copy on write. (dual writes) After that first rewrite of all those blocks you can't really tell the difference that the snapshot exists. This obviously assumes that you don't have a ton of additional snapshots compounding writes..