@akage,
I suppose it depends on your vet.
When we had to put Lulu down, they treated her like a little queen.
She didn't mind the car ride there, as she was fading anyway. Plus she was in my arms, which comforted her.
They took her in the back for a moment, and clipped her hair has gently as possible, inserting the IV.
When they came back into the room, they were carrying her in this fluffy bed. She was all swaddled in the middle of the bed, and while I felt very sad, I also so appreciated at that moment that they knew how important she was at that moment, and treated her to every comfort available. She looked like a little princess.
When they placed her on the table, in her bed, we had plenty of time to stroke and comfort her one last time. Then they injected the drug into the IV, and she very gently laid her head down and went off. I was very attuned to this cat, and sensed no drama/trauma or fear on her part.
I feel they treated her with the utmost respect.