I can't remember the last time the speed at which I could physically produce code was the bottleneck in a project. It's all about design and thinking through and documenting the edge cases, and coming up with new edge cases and going back to the design. By the time we know what we're going to write, writing the code isn't the bottleneck, and even if it takes twice as long, that's fine, especially since I generally end up designing a more usable interface as a result of using it (in my tests) as it's being built.