Still the real price not much different from today, Contemporary hotel room in 1972 was around $45 which is around $300 today with inflation factored in, plus there was only one park then. I can book at Contemporary room for $348 for this week, very close to the same amount as back then, with four parks and a bunch more amenities even without DME.
In 1987, poly rooms were $187, in today's dollars $430
GF in 1988 was $160 around $370 now
Disney room costs have go up a bit but the vast increase in prices is due to inflation.
In 1971 : Average salary was $10K, new house was $25K, new car $3K, movie ticket $1.50