The Pilot establishes the strengths of the series. Since we go 75% or more of the pilot, over an hour in fact, without ever seeing Superman it defeantly establishes Clark as the real identity.
On the other hand, in the very first seen we see Clark we see him do something Super. Part of me wonders if it would not have been better to have the stopping the bus scene after he gets turned down for a job by Perry. I guess CK=SM is so well known, that it would not help.
Also, in the pilot at least they live up to putting Lois first in the show name. Although that is largely just a play on Lewis and Clark, we see Lois first and about as much as Clark overall in the Pilot.
