I am either old school or lazy; I just cannot bother with learning a new system and maintaining it all.the.time. So yes, PC is my hammer, and I just double click on what I want to watch. Ir just works.

(typically when I mention this, somebody will helpfully pipe up that "It's easy! You just need to download this, that and other thing; open up these ports; setup the server and TV on its VLAN; make sure that these drivers and codecs are installed and updated; etc etc etc" with zero awareness of how much extra work it is compared to "double click on movie file" :D )