As someone who has been aboard a few helicopters in my life I have to say the turbulence seem WAY over the top. ( hell, had my first helicopter flight as a newborn )
In real life you will also have pockets of turbulence, but the vast majority of your flight will generally be pretty smooth flight, exception being specific weather conditions of course.
However in GTA V the turbulence is almost constant, There is rarely a 5 seconds timespawn between the pockets of turbulence, and the effect the turbulence has on the chopper is often way more then what a real chopper would experience under normal conditions.
And even if the turbulence was as severe in real life under normal conditions that would still not be an excuse for making something a fun as flying, into something potentially tedious and nauseating.
That said, Its important to note that the effects of the wobbling is FAR less noticeable in third person, if you doubt that theres to much turbulence, I suggest you try to fly in first person, not only will it be more noticeable, but it will be directly nauseating as instead of just your chopper wobbling in 3rd person, your whole camera wobbles (constantly).
The biggest sinners are the Buzzard, Cargobob and the stuntplane, but even the loveable frogger wobbles alot more then it should.
Don't get me wrong, I don't want turbulence removed from the game, not at all, I think its an exciting feature, however it should not be something we have to wrestle with 24/7, that makes it a tedious feature rather then an enjoyable one.
Infact when the weather conditions are bad (rain/thunder) I would welcome a even more noticeable amount of turbulence, as rain is not overly frequent, and the turbulence actually makes perfect sense under those conditions.
And I am definatly not a bad pilot in gta v, I can easily maintain very high speed while flying a mere 1 m over pretty much any of the roads, going full speed trough tunnels is something I have no issue with, and one of my favorite past times while waiting for gta online is landing on moving trailers and trains (in first person view).
Yet I am sure there are pilots out there far more capable then me, my point is I am not complaining about wobbling because it is making it difficult for me to fly, infact the turbulence has very little impact on what I can actually do in a chopper, the problem is the negative side effects that come with such a constant amount of wobbling, like I said before it can make flying feel tedious and most importantly nauseating.