Should I still keep waiting for it to eventually come or should I just jump in? Specifically, I hate how terrain now is so jagged and straight. It used to be all curvy and natural...should I keep waiting?
First of all, It's not coming back. So you either don't play for the rest of your life, or learn to adapt to it. Secondly, the "Large biomes" world type is good for getting more varied terrain. Things like forest mountains, and beaches are a lot bigger. Third of all, use mods if you REALLY want to the old terrain back, such as the generation ports mod.
They let you have fine to excruciatingly fine control over the Perlin noise used to generate the terrain contours and fractals for biome layout.
Or you could try using your old 1.2.5 jar and using either of these to generate a custom map with massive, broad, rolling hills and winding, gentle coastlines with gravel beaches a la beta 1.2_01.
Or you could use an actual alpha or early Beta version of the game, pre-generate a large map, and drag it through two chunk format changes and three new ores using NBToolkit/OreGen and MinecraftLandGenerator.
I'm hoping the OP means Alpha or Beta terrain, because classic is just awful. XD
So many people look at carefully cherry-picked and framed pictures of amazing Alpha/Beta terrain, and then wish to have it back, usually comparing them to very candid and bland pictures of modern terrain.
I learned from my much-hated experiment that if you take pictures of random terrain from random seeds in random versions, most cannot tell the difference between 1.3 and Beta, and then will accuse you of somehow hacking the forum and rigging the poll results.
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I see PLENTY of interesting terrain myself in the current version of the game.
But when I see (and just remember) terrain from before biomes, well..... literally EVERY area was "lumpy, bright green, sparse and overly random trees that never make a forest". Everything was the same bloody color, the "crazy mountains" eventually (quickly, actually) stopped being interesting or neat after you'd seen the 9847528937th one, and so on.
Landscapes produced by the current game do NOT all look the same. Landscapes provided by the OLD version though, rather DO look the same.
Really, if that sorta thing is the reason why you're not playing Minecraft and not enjoying BOATLOADS of new stuff..... then there's no helping you. Find a different game to play.