You're right. It takes too much time to learn aikido. And aikido doesn't have solid teaching method. 'Saw it? Do it!' policy of Aikido put you into 20 yerars techniques trap. And most techniques are designed to be gentle and safe. It could be a weak point.
But it also means you can practice with 100% speed and power without injury. And aikido can be nasty enough. In Japan, there's a speed limit controller for cars, so even if you buy Porsche, you can't exceed the limit. I heard there's workaround for it. Same goes to Aikido, you ca exceed the limit.
Anyway good luck!