Those with a prominent 8th house in their chart are better at manifestation of thoughts, yes. People with an especially good ability at this notice it throughout their life, they are the people that easily achieve anything they set their mind to. They will also obviously have an early advantage in workings.
Worth mentioning that just because certain birth placements have certain advantages, this doesn't mean that people who don't have these placements can't make up for it with sufficient meditation.