ZenGalacticcore,
As I pointed out, the Apollo program skewed practically every aspect of space exploration by throwing any reasonable timetable out the window. Launch vehicle technology probably would have advanced in tandem with our capabilities off-planet if we had not charged off to the Moon right out of the gate. The original designs for the space shuttle, back about 1970, were for a small, two stage to orbit vehicle, which would have been used to ferry people to orbit, where they would meet payloads sent up on large rockets. This was the kind of vehicle which could be operated fairly cheaply, in weather that was marginal, because it was a horizontal take-off design.
But Apollo caused such drastic cuts in NASA funding that the agency had to seek a partner to help pay for the next generation of launch vehicles, and the Air Force was the only one willing to dance. They wanted to be able to launch payloads the size of a bus, to accommodate intelligence missions. This meant that the lifting body that was the key to reusablity had to be huge, because the payload was going to be carried inside the vehicle. There was no way that such a large vehicle could be launched horizontally, so the engines had to be beefed up to handle launching vertically, which meant that the fuel for the engines could not be carried internally. The external tank got so big that boosters were needed to lift it, resulting in the vehicle being even bigger and more expensive to fly. NASA would probably have abandoned the whole reusable idea, except for the fact that the public was getting outraged about throwing a Saturn 5 rocket away every time we launched.
But NASA managed to come up with something which would have worked, if Congress had agreed to build a big enough fleet of shuttles for economies of scale to come into play. But Congress was still smarting from the Vietnam police action, so no fleets of shuttles were going to be paid for. Then the Air Force bailed out of the program, going back to expendable rockets, and NASA was stuck with a vehicle that they definitely did not want, and one that they had no mission for.
If it had not been for the Apollo program, we probably would have seen a two stage to orbit, totally reusable space shuttle come along in the late 1970's. There is a good chance that it would have been used in the construction of a space station, which would have been assembled from modules sent up on Titan IIIC launch vehicles. We would probably have gotten to the Moon in the 1990's sometime, and we would probably still be developing bases there about now, while we designed a deep space vehicle to go sniffing around Mars, Near Earth Asteroids, and maybe even Mercury.
Unlike aviation, the technical know-how existed very early in the history of space flight to build advanced vehicles, but the money just was not there, because of Apollo. Apollo was also the reason that money for a space station was so hard to come by, because it would have seemed like we were going backwards. But a space station is essential for learning how to live and work in space, so we couldn't very well advance until we had built one. The Apollo program probably set back our efforts in space by at least 30 years, and we still have not escaped from its shadow.