GTD wastes mental energy?

[jenter]

Hi everyone!
I'm trying to adopt GTD for managing my projects and tasks, and have stumbled upon a problem with contexts. If anyone would help me clear things up, it would be great.

The typical scenario in GTD is that you find yourself e.g. near a telephone and start doing your @phone next action list. Or you are at a PC and do the @computer list.

GTD is (on the surface) against multitasking, but I've found that going through the lists in this fashion forces me to switch between my projects like crazy, and I just feel how my energy is wasted on the switch!! It is a proven fact that human brain requires up to 15 minutes to switch from one project to another. I feel that razor-sharp focusing on only one or two projects per day brings much better results.

Moreover, doing something just because I'm at a phone, or in the city feels stupid. If it is an important thing to do, I'll change my context, but I want to see it!

So for the time being I decided to use contexts only for tasks and projects which don't require a lot of thought - paying taxes, doing errands, etc. For my main projects I find that more traditional project planning with hierarchical tasks and daily to-do list work much better.

But maybe I've got it all wrong. Could you explain this to me please? Thanks!