I once left a job feeling the kinds of things you have mentioned. I greatly enjoyed the work I had been doing, but the dynamics of the overall environment were way too busy and stressful for me. My supervisor just said "Okay" and turned to tell someone to go take my place, but one co-worker wished me well and thanked me for some things I left behind for him. My next job was the last I ever had prior to disability and retirement, it was in a strong family environment and turned out to be a near-perfect ending for my working days.