I feel you!Well, eating more vegetables, beans, fruit etc. "feels healthy" so it gives a good feeling. If it will help dying several years later is something one will never be able to prove.
In the end a diet is always a compromise. Even if there was "a best diet ever" it would be worth zilch if basically no one is able to follow it longterm. So I rather follow a diet that is manageable for me.
But--a wfpb diet isn't so much about adding years to your life, but improving the quality of life.
I have followed Dr Gregers plan daily dozen, with no oil sugar (I never quit salt) and I will attest to it improving my well being. I had no need of my daily asthma maintenance inhalor, had no allergy symptoms, tons of energy, stamina. I did great for maybe two months, then fell back into my far more moderate vegan diet. I think a lot had to do with not knowing how to deal with all the new feelings? I don't know.
I think it's just harder when you're not really that unhappy with your current health. I've known people with severe health problems stick to wfpb diets completely and they definitely have regained their health!