I would agree with you if it were simply suicide, but it's physician-assisted suicide. Taht is giving someone lese the right to kill you on the pretext that you asked him to -- even if you didn't -- similar to the Schiavo case, only faster.
In neither case is that acceptable.
Actually in the Oregon law the doctor only gives you the medicine, one must take the responsability of taking it themselves. If you are physically unable to take the medicine yourself then you have to go out the old fashioned way (zonked out on morphine (for weeks)administered by a hospice nurse and/or family menber until you dehydrate or the fatal disease catches up with you)