All the pools I have been in at WDW have steps and ladders.
I have not been at Pop Century, but here are some pictures that show the steps. Pool picture 4th row, farthest to the right shows the pool from right in front of the steps (you can see the bottom steps and the handrail.
The pools have regular steps. The bowling pin pool had wheelchair accessable steps with a rail... you can see them on the left in this photo http://www.allearsnet.com/acc/popcent96.jpg