Real estate agents are indeed dispensable and usually do not contribute anything substantial to property brokerage ... the really interesting properties are directly mediated to customers pre-registered by the agents.
Personally, I do not think much of real estate agents. But in the quoted area, the argument is somewhat contradictory.
There are actually two primary providers for offered properties.
1. The seller himself. If he has a property that is good and is likely to sell quickly at the desired price - AND he also has time for a few viewings - it is worthwhile for him to market it himself. Why should he incur costs if he can save them?
2. The agent: If the seller does not have the time and inclination to take care of it himself, he commissions an agent.
2a) For good properties, is right: These often go to registered interested parties whom the agent has stored on his list of prospects. Thus, he would have the possibility to close quickly on interesting properties.
2b) All remaining items, which are not so easy to sell, are offered through the agent. The song by Die Prinzen comes to mind: "Spoiled food, at exorbitant prices."
Point 2a) may make it interesting for you to get in touch with an agent. However, if you come across a property of your desire through him (even if it is only the mention of the address or an online listing) and then arrange everything else yourself, to my knowledge you still have to pay the commission to him.
I would also recommend that you take a closer look at new construction. Especially when the market for used properties is heavily picked over, you often get junk properties offered at high prices (plus subsequent high modernization costs), which makes new construction more worthwhile in the end. After 3 years of searching in the used market, we took the step to new construction.