I have two shops I get fills from 99% of the time. One does not do nitrox at all. If I get fills from him I do not analyze. The other does partial pressure blending and has a dedicated O2 whip that is not connected in any way to the panel from the compressor and banks. If he fills them and I am not standing there while it's being done I analyze when I get home. That happens maybe once every 20 fills. Otherwise I am filling them or right there when the tanks are being filled. Those don't get done. They do get marked though with a piece of tape as they go in the truck.
If I get fills on the road at the quarries I travel to it depends. Sometimes I am there, sometimes not. After my rebreather experience a few weeks ago I have decided to start taking my analyzer or use theirs to verify what's in them. Had nothing to do with the accident that inspired this thread. That was a personal decision after seeing how easy it is for something to go wrong.
And my checklists are getting revised to include analyzing before I go out the door now even though I have no tanks with nitrox in them.
Just don't use it as there is no benefit with the dives I am doing now I have a number of tanks marked for it with those ugly green bumper stickers that came on the tanks when I bought them.
My O2 bottle and one 50% stage also have permanent markings but sometimes get used for other mixes since I have not done a dive that required 100% in quite a while. In that case the markings get covered and even though I know there is air in them they get analyzed before I take em out and a current analysis label slapped on.
Analyzing gas is cheap, easy to do, and adds a measure of safety. It is not always necessary. But if we are diving together and you ask me to check my tanks I will. By the same token if I ask you to do it I expect the same courtesy.
The incident that inspired this thread resulted in a dead diver. That dead diver set a very bad example for some new cave divers that were on the trip with him by refusing to check the mix in that stage.
That is not to be taken lightly.
Whether it be hero worship, a fear of questioning a more experienced diver, a failure to recognize that this time the guy was being a friggin cowboy, and therefore a danger to the whole team and perhaps other teams, or just being simply overloaded with the whole experience of getting a full cave cert, they did indeed screw up almost as bad as he did. They just didn't die. But they could have.
So for most recreational dives I agree that analyzing MIGHT be overkill. But when entering any kind of overhead, real or theoretical, a failure to analyze may kill the entire team.
A failure to insist the diver analyze may kill the entire team.
A refusal to analyze may kill the entire team.
A failure to refuse to dive with the person that will not analyze may kill the entire team.
That refusal might be the only thing that gets the cowboy to check his gas and possibly save his life.
If that still doesn't get him/her to do it and they go alone - they get what they asked for.
And still it's ignorant because someone else has to go in and pull their sorry dead butt out and put themselves at risk to do that.
That is also what I am taking from this.
. Oh, and then he paid for that mistake with his life. 
