We're < 100 employees, so I handle the Marketo admin and data management tasks (part time), but most program tasks (e.g. creation (mostly by cloning) of programs, landing page, email, share button, etc. ) are delegated thoughout our marketing team.
It's been 2 years since we deployed the platform, so my recollection is not real clear now. I went through the 3-day online training course, which was very helpful. We were up and running in a couple of weeks and my discusssions with the enablement person were unstructured and probably not as informative as they could have been in part because I didn't know what I didn't know.
The onboarding process may be very different now.