I know for me that I have periods where my walk is very strong. When I really felt God for the first time I thought it would never end. During that time I judged alot of people because I could tell they weren't feeling it and taking it as seriously as I was. I spoke as you do and was upset with people for not walking the walk. Everybody gets their turn however. I have seen pastors fall off, church leaders fall off, you name it. The people that profess God the most and the most vocally are the ones you got to watch, those are the ones I've seen disappear more often than anybody. This thing aint easy.
I learned that I can't sum someone up by their current actions. It isn't that easy. I'll give you a word of advice, when you look at somebody and they way they are acting you don't always know what got them there or how long they'll be there either. The minute you put yourself above them God will touch them and you'll be eating crow. They may have been on fire just 6 months ago, maybe 2 years ago. The time will come when you will not feel God's presence as strongly. During this time you may have some folks looking at you goin', "what happened to conscience, that dude is straying, he aint walking the walk, he's a sinner. he just needs to know the Lord and get his butt to church." This can happen to anyone. During this time many fall away and stop doing the things that will get them back to that spot they were at with God before. Sometimes you can't do anything about it, you have to faithfully wait for God. It can be very trying, I know, I've been there.