Unless you have oily skin, it is not necessary to remove all of the soap from your skin. I find that those soaps with superb residual slickness also provide a wonderful post-shave feel. The soapy components are water soluble, so they will rinse away leaving skin friendly ingredients behind. Oatmeal is supposed to have antioxidant and anti-inflamatory properties that are good for the skin.
I'm on my second shave with Yardley and I'm quite impressed so far. This stuff has the best residual slickness of any soap that I have tried. Admittedly, I haven't tried more than a few dozen, and most of them were old standbys like Arko, Cella, Haslingers, Proraso, Etc. That said, even the artisan soaps I've tried from Stirling, Grooming Dept, & Wholly Kaw, haven't had this level of residual slickness.
I know you've tried a bazillion soaps; are there soaps you would recommend that have residual slickness on par or superior to Yardley (irrespective of price)?