If your not running any multicast applications that require routing across VLANs or network boundaries then you do not need it. Much of the multicast you see is probably link local and is not meant to be routed anyway.
If and when multicast routing is needed, that would be the time to implement it. Doing it now without any real reason is creating overhead in and of itself.
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You mention wanting to use IGMP snooping, but it requires an IGMP querier. That is often provided by the multicast router; unsure whether it requires PIM to be enable on an interface.
The only "bad" thing that comes to mind, if you enable PIM, you could forward a multicast stream you don't want forwarded.
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