I do very much think that Bertie humanized him and gave him a home. Jeeves seemed like he had been something of a drifter before he found Bertie. He may have been somewhat self-satisfied, but I don't think he was really happy before he found Bertie. Even if we don't want to read it as slash, I do think that, in his own stuffy way, Jeeves actually genuinely loves Bertie, and we all know that Bertie utterly worships Jeeves and tries to be a better man for him. He'd never have done it for a woman, only for Jeeves.

They may spat and disagree on a regular basis, but they are very much a symbiotic relationship. One without the other feels so terribly incomplete. They have, over their years together, changed one another and made each other better people.