I agree with 4runnerguy. Personally, I have definitely noticed the increase in camping traffic, especially on weekends. For us, reservations are the only way to go. I like knowing that a spot awaits us when we arrive. Unfortunately, I don't have the luxury of time driving around looking for a spot to camp. They say it's not about the destination, but the journey, but we enjoy going to a specific place for the destination (The "journey" is sometimes a perk!)
We mostly do state parks and I do notice at least one spot in a camping area/loop that is not reservable on-line and is for walk-up only. In Colorado, the reservation window generally opens 6 months in advance. If you want a spot on a popular weekend or holiday, you better reserve when the window starts! Just my 2 cents.
