I think estimation can mostly be forgotten. The planning part which the author identifies is always helpful. Sure, get the team together to plan features and get a feel for the goals. Even get biz analysts together with folks to determine req's.

But do we really have to tell you how long it will take? When a lot of managers just take the estimate and multiply by three can these estimates really be trusted? What's the end game? Is it any different than just building it out? If you have a hard set of features then it will get done when it gets done. Just predict what half of what year. If you're an agile enterprise, then timebox the release and build out from there. Why must we all do this absurd dance of time estimating?