Regarding your point on recovered datastores, they actually aren't all that normal. During the recovery process, vSphere resignatures the LUN and it's this need to resignature the LUN that makes vSphere treat it like a snapshot. The "snap-" prefix, as @memadd states, is just default convention used by SRM when handling resignatured LUN, which they all are during recovery. The recommended option to keep original name works well, I've used it prior to datacenter migrations.
These might help.
VMware KB: Snapshot LUN detection in ESX and ESXi
http://searchvmware.techtarget.com/tip/Resignaturing-VMFS-volumes-The-forgotten-VMware-SRM-subject
http://searchvmware.techtarget.com/tip/The-mechanics-of-VMware-Site-Recovery-Manager-resignaturing