You do realize that is how a lot of action anime fights go right? Ichigo is the only one that does this and will not be the last one that does either. I think I relate it a little to the style of sword fighting that is a little more common in Japan. This is just me guessing as I am not completely sure. But the style of the Samurai is one hit, one kill sort of thing. So the whole stand off thing draws back to that. You put your all into one strike and you make it as clean and perfect as possible. The one with the better swing wins.

This happened in Yuyu Hakusho with Yusuke and Taguro. It happened in Cowboy Bebop with Spike and Vicious, a couple times. For them it was lets finish this and they hand over their weapons for the final strike. It does not always happen as a charge up and strike, but the final blow is fairly common. It is in samurai movies as well, which is where a lot of goes back to I would imagine. Both of you are at the end of your strength, all you have left in you is one more swing. It is decided by the strong will and determination. It is not purely about strength and being better than the other. It is about resolve, which is what every fighter gets at the end. The good guy finds that resolve that gives them that edge to win out.

And let's face it, Ichigo is always out classed by everyone that he goes up against. That final fight at the end of each arc or movie is going to be the hardest fight of his life. And the person at the end is going to be overwhelmingly stronger than him in every way. But they are doing something that makes Ichigo find the resolve to know that he must win because he has a stronger reason and purpose to keep living and survive than the enemy.

Ichigo is always going to get beat around by his opponent. They have years, centuries of experience and honing their abilities over him. All he has going in is guts and guts only get you so far. He can only get out with his resolve. It is going to end up being that way for all of his fights. Ichigo is eventually going to have to fight Aizen, and he is as strong as they come. He can beat even the most skilled captains without putting out an effort. You really thing Ichigo is going to fair any better than them. He is going to pull out of his massive spirit energy bag of tricks the resolve to win.

Spoiler:
Aizen did take Orihime, that is resolve enough for Ichigo to bring down mountains if they are in his way. He went all the way to the Soul Society to bring back Rukia. And he has known Orihime for even longer. He is going all the way to Hueco Mondo and going to kill everything in his way to bring her back. That is going to be his resolve and it will elevate him to new heights of power as well as over come his 11 second time limit on using his mask. Its going to do a lot to change him. But even in the end they probably do a massive power up that rips apart the headquarters of the Espada and then charge at each other. And they'll look cool doing it. ^^;