As someone who rolled Horde for the first time very recently, I can say I have not had any issues finding RP even casual/walk-up. From reading guild adds, I see that a far few also raid and do PvP. There’s also a community in the game if guild isn’t your thing and with as friendly as I have found the Horde to be OOC also, I bet you won’t have too hard of a time finding people who are willing to get together for PvE things outside of guild specific only.
Kwixit already listed the wonderful Alliance to Horde thread/discord and I think if you poke your head in there, you will find it as wonderful as I do.
I would also take a quick peek at this thread and you will notice a fair share of fresh Alliance players now checking out Horde with positive feedback/personal experiences in it (myself included)
I strongly recommend checking things out!
Oh and not to spam you entirely BUT you did say Tauren and I know there’s a weekly public event hosted by The Stonewind Tribe - you will find a guild packed with Tauren of all kinds in it! (Any race welcome to the event itself!) Thread below if you want to casually swing by and check out things ^^