Everything was spread out and low to the ground at MK. No mountains (Splash, Space, etc) and even though it was spread out, there were a ton of people (this is August of '73) so getting on the attractions was sometimes a long wait. It also felt a little stagnant... between the heat and humidity and the lack of kinetics (seeing stuff moving around) it was odd. I do remember thinking that it had promise, though...I liked the attention to detail and the attractions were interesting without having to be thrill rides. First trip to Disneyland was probably 15 years later, but just looking at the map from the 70's there was a LOT of stuff back then and elevated, I guess... things were moving and close in and there was energy and excitement.
Having been to both lately, I prefer MK to Disneyland and I'm one of the odd people that actually really enjoy California Adventure and like it more in many ways compared to DL. Disneyland feel TOO dense now... and it feels like a patchwork of ideas and rides, particularly Tomorrowland. With everyone pushing strollers and the narrow pathways of DL, it's too much.
So, take my opinion a grain of salt since telling most people I think MK>CA>DL is heresy.