People question you but there's actually some good reasons. My first international flight as a teen was via travel agent and they managed to get me a $300 promotional ticket to Japan (usual price $800 at that time). They even hooked me up with a train pass, too.
That, and I read that any multi-destination trip can benefit from an agent, usually saving more than you spent on the agent. My guess is the train passes and things like that can also help a ton.
I used to use my credit card concierge for that but now they're impossible to get in touch with. I skipped everything in between and now just do it on my phone, generally while drunk as shit in the middle of the night.