Whilst I might agree about LHR, the same goes for any BAA 'managed' airport ...
I use LHR because it's close and I can get to everywhere from it and I use LTn because it's closest to me and I can get to an increasing number of places. I would have voted for LTN but the owners (not just the current bunch) have been working very hard to discourage my use of it and make the experience more unpleasant.
Dundee (DUN) I have only used once but it was great. I walked from the client (about 1/2 mile away), the terminal was small and quiet and I walked out to the Business Air (had just been bought by BD at the time) and boarded the Saab for the 11 minute hop to EDI.
Now, if they could figure out how to make LHR work the same way ...
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"I tell you, we are here on Earth to fart around, and don't let anybody tell you any different." Kurt Vonnegut, Jr.