Then there are the reactions of the entire DS9 command staff in "Trials and Tribbleations", demonstrating the legendary status of Kirk's crew.
This is the best and obviosuly most direct example in the canon of 24th century humans' reactions to the original TOS cast. Granted, the DS9 command crew were standign in for the writers and the fans in this epsiode, but that doesn't change the fact that this episode is canonical, as are their reactions. It's clear: Kirk (at least) is a legend in the 24th Century. The TOS
Enterprise is sight-recognisable, and described as 'Kirk's ship' (not 'Pike's ship' or indeed anybody elses).
Generations supports this idea as well, woth with the opening sequence on the E-B and Picard's reactions to him.