would waking up literally surrounded by the horror terrors in the outer ring result in you being corrupted like rose?

I mean not really, she just obeyed their will and gazed into the unknowable with her Seer Vision. They’re just. Calamari with teeth basically out there. If you were physically there, it’s likely they’d have some weird psychic effect but it’s not like they want to corrupt everyone and everything. In fact they didn’t even really corrupt Rose as much as they… Granted her a boon. They nudged her to seek revenge, but they didn’t make her do anything she didn’t want to already.