I've recently established a repor with a local game warden and we both favor a courtesy call to let him know when and where I'm hunting. I only view this practice as a positive gesture in my case. While I know this doesn't apply to everyone and I've rarely witnessed it from others, I'm curious to know who all else is out there doing this...
It all depends on your local game warden. I used to call before varmint hunts and it only prompted some game wardens to come out and check us. Messed up my "call sets" on a few occasions.
The last time I called a game warden (a good acquaintance of mine) he got aggravated and asked me if I called the local DPS every time I planned to drive on the highway!
I got the message!
Game wardens enforce the same laws but have different MOA's. I dont bother them unless I have to. I expect them to do the same with me!

I do recommend you get to know them. Most of them are really great guys and share the same love of the outdoors as we do.