Absolutely! You are entitled to the same priviledges as any other guest staying at any other WDW resort.
However, I just read that you should reconsider early-entry depending on what time of year you go to the parks. For example, I have heard that during peak periods (Christmas, Spring break, summer), you should take full advantage of early entry.
But if you're going at a less crowded time of year, go to a different park than the early entry one. (Reason being, all resort guests flock to the early entry park leaving other resorts much less crowded.) Of course, this only works at low attendance times of the year.
The book "Unoffical Guide to Disney" has a whole chapter on attendance at WDW, best times to go, etc. which really helped us plan our trip. Good luck!