An abortion is a serious medical procedure - it is a surgery and can have disasterous effects mentally, emotionally - and so forth . . . it is really the provider's responsibility to ensure that they have communicated the facts. All other reproductive-related procedures have a serious-approach and response such as when I got my tubes tied. Since it was a surgery in a hospital I had to wait - had to be prepped - my doctor frequently cautioned me about the 'permanency' of it, the side effects, and so on.
Demanding it on a walk-in or quick-appointment basis is undercutting the importance of it. You wouldn't have any other medical procedure done in the same manor - why is an abortion different than any other medical procedure? Even getting certain emergency procedures done at a hospital require informed consent.