The difference is night and day! There are minimal muscle contractions and you may "ejaculate" a small amount of urine. Minimum feeling of pleasure.
I’m a prostate cancer patient, had exactly the same procedure you’re talking about. They are correct - in a radical prostatectomy, the seminal vesicles are removed & you will no longer ejaculate. Maybe at some point in the future, they’ll find a way to preserve ejaculation, but it’s not possible now w/ this type of procedure. Also, quite often these other structures are cancerous as well so would need to be removed anyway.
I’m like you - always enjoyed the feeling of ejaculating, and without that now, I do experience orgasm, but for me personally, it’s lacking smthg without it. Some guys say they don’t miss it & say it feels the same, but not for me. Maybe you’ll be one of the lucky ones who still gets the same degree of satisfaction w/ out ejaculation.
Anyway, good luck to you, hope the procedure goes well & that above all, once you’re done, the cancer’s gone.
Even with. No semen you will still have the pleasure