Not sure what warehouses you are remembering.
I also remember the last half of the 20th century very well, and don't remember any "warehouses" within a mile or two of Disneyland. There is a light industrial area a few miles away near State College and Ball Road, but that didn't develop until the 1970's and early 80's. There were plenty of motels and coffee shops on Harbor Blvd. and Katella though, beginning in the late 1950's through to today. Some larger hotels, like the Grand Hotel on Manchester or Sheraton on Harbor, arrived in the 1960's and early 1970's when the Anaheim Convention Center (1967) was new.
An aerial view of Disneyland from
1958, three years after opening. Still several large plots of orange groves and vacant land around, but also a growing collection of motels and coffee shops on Harbor and Katella, with the succesful Disneyland Hotel on West Street. No "warehouses" that I can see.
But then I think I found your "warehouses"! They appear in this aerial from 1964, on the far east of the shot near the Grand Hotel. Those buildings still exist today on Manchester Avenue and are a dental supply business and a US Customs Office. Technically they aren't warehouses, but they are broad and flat. Still lots of vacant land and a few orange groves left. Harbor Blvd. is becoming Little Las Vegas by the mid 1960's.
Here are those two buildings, your "warehouses", as seen from a westward angle in the late 1960's or around 1970.
FUN FACT: This photo was obviously taken on a Monday or Tuesday in the off-season, because it's early afternoon by the angle of the sun, but Disneyland is closed and the visitor parking lot is empty!
The larger of those two buildings was originally Altec's sound labs. Altec moved it's sound and speaker labs to San Diego in the 1980's and the building now is home to Sybron Dental Specialties. It obviously had a new front façade put on around the 1980's, as it looks like this today as you drive by on Manchester.