I agree, and this is what happened when I last resigned from a job. I wanted to move abroad, so sat down with my boss and had a nice conversation about it. We set a rough timeline for five months, and then went about hiring my replacement and getting him trained up. I walked away with everything nicely in place, and I think it's been the best way I've left a job ever, no worries, bitterness, just things being the way they should be.