I have a SSD on my Macbook Pro. Totally worth it. Definitely snappier in booting up, starting up apps, and any disk i/o-intensive operations. It's certainly noticeable.
Also, you don't need to sweat the higher price per byte, because more and more of my files (and I would assume yours?) are on the cloud every day anyways, so 256GB or even 128GB is fine for me these days.