Just my two penneth, it's been my observation that (client) divers that get experienced enough, need a little more than the action of diving. This is to say, dependant on the individual, after a given number of dives the diver starts to become interested in other aspects of the hobby or, more likely, build on already established interests. "Follow my leader" is no longer enough. Speciality courses seem to cater for exactly this mode of behavior. Some edge towards "macro" sealife etc, some DPV, Wreck, Photography so on and so forth. Personally, i'm totally with Nemrod. To grab a DPV and go off as far as i can looking for what ever's there is my thing.
I studied from AOW to Dive Master at a VERY busy dive center through most of last year and durin this time i saw all levels of diver. From the dregs to the super experienced. The difficulty for professional staff (particularly new!) is to gauge the requirement of the group. This, i can tell you first hand, is an absolute art! A good DM/ Instructor that gauges the group and correctly caters for it's level of experience and compitance is already ahead of the game. One that can intuatively accomodate the special requirements of 20+ strangers is nothing short of a ledgend!
Help'em out by politely telling them what you want to do and explaining you're hopes for the dive.
Taking my Fin off would have got my attention very effectively! (I liked that one, i was constantly told to slow down as a DMT)
Even HAVING a requirement indicates you are of a fair level of experience.
I'm not defending the actions of a company that'd send 35 clients out with only one Dive Leader. Although, if all fully qualified, it shouldn't be a biggy, it's still crappy. But by the time it gets down to the level of the onboard crew, they just deal with it. ANY help offered by sensible experienced divers is greatly appreciated even if it's only the indication that you and your buddy don't need hand holding. Seeing you rig up and enter will be evidence enough to a watchful eye.
Corse there's always muppets that "know better". Speak up early rather than late and you just might avert a bad day if you're tactful. Just remember Billy Conolly's advice "No matter where you travel, never bother to pack an idiot! you'll always find plenty there!"
Regards
Dan