I consider dissociative holes to be a form of ego death, yes, in fact some of the most profoundly dissolving of mind states. I actually prefer to call it ego dissolution, because if the ego totally "dies", then there is no longer a "you" to remember the experience. Generally what happens is that your ego is so dissolved that you may barely identify as your individuated self, or you might even forget that you're a person, but there is enough of you left to form memories of the experience. In my first "ego death", for example, I did remember that I was this guy Xorkoth, but I was also everything and everyone else, I was the universe, so my Xorkoth-self receded so far back as to be unremarkable, just another frame of experience amongst a sea of infinite experiences.
I've got band practice tonight, and then there is the 10th anniversary of the local funk jam, which I'm going to go to. I decided on a whim upon discovering that fact to take some AMT, so here I go. Definitely should be fun, I'm gonna be pretty drained tomorrow though.