When the elevator doors open to the 4th floor, one first walks past several non-CL rooms. Keep walking past those those non-CL rooms and you reach a CM desk area and a keyed entry door to the CL area. This desk area is the greeting area for CL guests and where you would do your check-in. If the CM is at the desk, he or she will usually "buzz" you in, or if no one is at the desk you can use your room key.
Once you enter the keyed entry door, then you will find the CL rooms. The CL Lounge itself is located along this hallway - the hallway opens up into a small lobby at some point, where the CL Lounge is on your right. But then past the Lounge, the lobby tapers into a corridor again and becomes more CL rooms all the way to ESPN. So you don't walk through the Lounge to get to the CL rooms - the Lounge is a separate room off to one side with double doors. Also there is a second CM desk in the Lounge.
It felt like a bit of a long walk to me the first time, but since then I've decided it's actually not bad once you know where you are going. Then there are a few rooms which are CL but located outside of the keyed door (must be referenced on the first page) and some people don't like staying there, since to get to the lounge, once must constantly go through the entry door to the CL area. However one of these rooms has the biggest balcony I've seen for a CL room. Some people also like these rooms because they are closer to the elevator.
Now there are other CL rooms on the 3rd floor - I believe they are the Deluxe Rooms. I'm not sure whether there is also a keyed area on the 3rd floor. I've only ever stayed on the 4th floor.
Hope that helps.