It just comes with the territory really. If you don't like last hitting, you won't like DotA, as it's the primary form of economy for the game. Yes, it's a bit silly, but to this day I haven't seen a much better alternative. Even the second generation MOBAs that have been released still include last hitting as a mechanic, even if it's diminished in importance. It's still a critical mechanic to the game, nobody has found a way around it.
Sadly, this is true. It's one of the reasons why I dropped Dota myself, as that game is by far the most obsessed with this particular detail (which I loathe). I dont mind it as much in LoL or some of the others, being that I can actually use skills/spells to do it (thus popping many minions/whatever at once and also making it less boring), as well as being encouraged to keep up a constant back and forth fight going with my opponent during the laning phase. Not to mention that the timing is less strict in those. And yeah, I know some players would say "Well that just lowers the skill needed, it's stupid that you play those", but I play alot of games that need MUCH more strict timing than Dota ever uses (fighting games, and of course the shmups I'm known for), so it's not a matter of that... I just find the strictness of it really annoying, not really difficult, particularly considering how slow the laning phase is in that game.
That being said, there really ARE ways around it, though of course nobody has COMPLETELY done away with it yet (bah). The one that's done it the best so far is Dawngate. I never, ever play carries in any moba (because of the last-hitting obsession), and as long as that's the case in that game, I never have to give a fart about last-hitting. I still have to concern myself with the minions, as they will of course be used to try to overpower my lane and get to the tower, but I dont have to worry about getting the killing blow on them ever. With the roles that I usually choose (which includes support) I get most of my gold from sheer harassment, which is MUCH more interesting. Aggressive, risky play earns me the gold I need. If my lane partner is around at the time, I just ignore the minions entirely; if he's not, I'll just throw an occasional spell at them to weaken the group and keep things going there, but wether it kills them directly or not doesnt matter.
And of course, Smite here honestly seems to do it pretty well also. In my time with the game (though I havent played in awhile) I never really found myself getting irritated with that aspect like I do in the other games, so that's a point in Smite's favor.
Also liking Strife's unique way of toning it down as well, though I still need a bunch more time with that game before I can really get a feel for exactly how all of it's bits are working together, but so far the impressions are very favorable.
And I am interested indeed to see how Blizzard's moba comes out. From what I'd seen of it it looked a little TOO dumbed down, but I've learned never to underestimate Blizzard as a whole.