You're looking at SC2's mechanics through your BW glasses. Warp Gates or Vomit Larvae would be game-breaking if they were transplanted into BW and let loose, which seems to be the backbone of your criticism, but in SC2 they work, in large part because of the balancing that you so despise. I'm not seeing any of these 'terrible results' that you mentioned, could you show me a video or a replay of them?
The BW comparison does not figure into my criticism of Warpgates and Spawn Larvae. I think they were both put into the game because of Dustin Browder's poor understanding of BW, but that doesn't preclude them from being good mechanics. Creep spread in sc2, for instance, is pretty great, and makes the game deeper and more interesting.
The reason Warpgates are bad is because they undermine the existence of defender's advantage by removing reinforcement time. Reinforcing being easier for the defender is a staple of most strategy games, and for a good reason - it stops the player with the larger army from instantly winning, which would render any investment in economy or tech pointless - you have a smaller army at one specific point, and you die. This is why Warpgates are bad. Protoss being balanced around Warpgates results in (tl;dr about why can come later, if you don't know on your own) them either all-ining, or turtling, which makes for boring gameplay.
Spawn Larvae is not as bad as Warpgates, and could possibly be salvaged, but in its current incarnation it makes Zerg core units suck ass. Zerglings were the best tier1 unit in the game in BW, but that was possible because production (aka larvae) actually cost money in that game. Similarly, BW Hydras were so much better than Roaches. Only high-tech gas-intensive Zerg units are allowed to not suck ass, because good early units would lead to an even more powerful version of the current ZvP roach max, which is only barely managable because roaches suck ass. So what playstyles does this leave Zerg with? Yes, either an all-in or turtling to a deathball.
Terran is really the only non-boring race, because their production mechanics actually allow them to have good, microable units. Amusingly enough, instead of making the other two races better, Blizzard seems intent on gutting Terran aggressive opportunities until they also either all-in or turtle.
I'm not entirely sure what you want me to link to, since all of this happens in a vast majority of high-level games.