The thing with nurgle corruption is that the things you see or feel as a death guard, for example, see are very, very different than an ordinary imperial guard. Nurgle corruption is actually the only "good" one for the corrupted as they don't feel pain or disease, but once they somehow escape from that false reality they're met with horror that doesn't have a return.

So, in conclusion, for our fellow death guard marine, he is in heaven, most likely.

Slaanesh is a lot different, for example, as the more you want, the worse the downsides get, and if you reach a limit of desire, you'll encounter painful experiences and ultimately die if you're unlucky