Don't be a scene kid, DW. Screams are american children's way to try and compensate for their lack of balls and vocal ability. Give me a break. The closest thing I'll ever accept are black metal screeches or nasal growling which sounds fucking cool.
Yeah screams to me aren't like screamo type bands who basically shout hardcore lyrics in a really annoying high pitched way. Screaming to me is like clean singing but using a bit of your throat and just a tad gutteral. The really, really long screams like Hypocrisy are what I like. In fact, I pretty much scream in Skylab similar to Tatgren. I don't have quite the high range he does but the same timbre.
DW, the way you describe it, bands like Maiden and Priest would be considered "screaming". I consider Trivium, Thrice, All that Remains as screaming aka vocal shitflingingintotheear.
That sounds more like screeching to me. Those vocals sound really interesting too, imo. Reminds me a bit of the high side of Glen Benton, or Peste Noir:
But you know what? I guess my drummer's vocals are kinda really closer to my thing...better to send you straight there. Listen to "Towards the Remote Future". I'm singing now but it's really similar, although I'm a little less Dani Filth circa 1996 than he is.