MG-H is still very small; there’s no covering for that. The level of activity in Orgrimmar varies by day and by hour and can be hit or miss, but there’s usually at least a few people in Valley of Honor in the evenings. That’s if you’re curious about walkup RP.
Otherwise, for guild RP or events, or requested interactions, things are pretty good. We’ve got a whole campaign coming up on the 16th that has had a lot of buildup in the community and has drummed up some excitement; you can find the forum post for it here: [H-RP] Battle of the Bilge - Coalition of the Horde RP Campaign
Coordination for it and many other things, along with just chill folks, can be found here in the Coalition of the Horde discord: https://discord.gg/T35KyqrZWQ