Over the years of working with many great people, I had built a habit of potentially over-collaborating with my peers. It was hard not to, considering how much smarter two people are than one. And with the right mixture of personalities and solving hard problems, it's almost always more enjoyable (even delightful) to work things through together. You get the stronger sense that together you are delivering a greatness that would be hard to achieve on your own.
I've really missed that part since I've been remote for the past few years. However I have had to learn to be way more self sufficient and resourceful. I think initially the transition hurt my productivity somewhat, but it also ended up making me much stronger and decisive because I couldn't fallback to the whiteboard anymore.
I think I still prefer the colocation style to some degree because working closely with great people is just so rewarding. Thankfully even while I'm currently in my fortress of solitude, I still have great peers to work and connect with through Skype. We have a team chat going all the time that is similar to the war room arrangement where we can socialize and discuss random (sometimes even relevant) topics.
All in all, working with great people is the key either colocated or remote.
EDIT: I should also mention that your ability to focus on your own dev work is great for personal productivity, but often your full value to the team is only realized when you shift your focus to helping the team. I've had many situations where I could have used one of those ticket dispensers because the line at my desk was out of control. I found that working from home for 1 or 2 days a week was a good balance in that situation. Time for some self focus and time for giving to the team.