Black holes are not the only objects with gravity, and therefore not the only objects producing time dilation. Even relatively light objects such as this planet create time dilation; unnoticeable, but enough that it can be observed, much like its curvature.

If there are black holes the effect is much more extreme. So extreme that if you fall into one you'd not only see the entire remainder of history unfold in minutes, but you'd also encounter everything else that's ever fallen into it and ever will fall into it. At that point you'd probably just get ejected from the universe, and a little too late for a reincarnation. If there is "spaghettification", the entire process only takes like 0.1 seconds, which isn't enough time for the sensation to reach your brain. But considering those things suck in things like stars, you'd likely be burned alive before then, so ouch.