I thought I'd weigh in here - been watching this thread for a while, but had little time to reply!
I own an agency in Hertfordshire (Harpenden/St Albans area) and it's true that the market is a little 'flat' at the moment - many of my colleagues in other areas (Hatfield, Leighton Buzzard, Milton Keynes, Finchley) are echoing the same sentiment - things are 'ticking over' but there's not a mad rush of available stock, and while there IS huge demand, buyers are being very choosy about what they offer on. The solicitors (conveyancing) and mortgage brokers echo this as they tend to feel the 'wave' of the market a few weeks after the agents.
The whole market at the moment appears to be walking on eggshells, but that's not to say that sales aren't happening and deals aren't completing. The big problem that I see personally is that many agents are sticking to their old ways and not adapting their marketing, their efforts and their presentation of your properties to the marketplace.
For example I see wonky, out of focus or dark pictures, sometimes taken from an awful angle, brief or incomplete descriptions and very little in the way of targeted social media marketing.
Another problem that many buyers are facing is that due to that huge demand spike, there is a call for 'off market' services (in fact we run one ourselves called Prestige) where vendors DON'T want a board or a rightmove advert, and it's easy to find a buyer because there are simply way more buyers than there are properties.
I wouldn't call other agents lazy, but many will be under the whip to get more stock on the books which tends to leave current clients languishing and you end up with the results we've seen above (in some cases) - no viewings, lack of communication, very little in the way of well thought out advice other than "lets reduce the price" - that should be a last resort, there's ALWAYS something that can be done first.
A little thinking outside the box tends to go a long way in my opinion - maybe tweet for an RT from a celebrity, or offer to give a % of the proceeds of the sale to charity and ask the charity to RT/like/share on Facebook - massive exposure with a little social media nous.
I don't intend this to be an advert but....I'd be mad not to say it! - if anyone would like my help and you're stuck with no buyers, let me know.