I definately think the amount of work shifts depending on who's controlling the market. In a buyer's market, I think you work harder for both sides. In a seller's market it all seems so much easier.
If you have the buyer, you look at more houses, you have to negotiate harder, it is more stressful because buyers want to make low offers (so you have to make more offers) or they need to learn the hard way to make a decent offer.
If you have the seller in a buyer's market, you have to do way more advertising, (website, adwords, newspaper, re mags, open houses, brokers open) more money spent, more thorough feedback, more time on phone, yada yada yada. Then buyers want a bargain.