Yes, if you are there at opening each day, you can wing it and still see everything. As we head into the summer season, people show up to the gates early. By 08:30am, the line goes to the ticket booths. Be there early, and watch for an extra lane that will open up. Most of the time, people form a line in 1 or 2 lanes, yet all of them will usually open on one side. So you can walk right up to the front of one and be first.
Going into the park early, you'll have 2 hours of walk on rides before the crowds arrive at 11am. At noon, the place will be packed and you'll want to leave, eat lunch, go back to your room, rest, then come back at 4pm.
But yeah, you will easily see everything with 5 days. I'd even throw in a morning visit to SWF if you need more to do.