I see you've already booked, but I just wanted to throw in my two cents anyway.
I've only used a travel agent once in the last 14-15 years - and regretted it. The TA herself wasn't the problem, but the circumstances we found ourselves in were an annoyance. For our last US trip in 2014 we booked the airfare only (Australia-SF and LAX-Australia) through a TA at a travel expo as it was cheaper than anything else I could find online at the time. All the domestic flights, accommodation, activities etc I booked myself as per usual.
During our trip my mother in law died. I immediately phoned Virgin Australia in the US to be told they couldn't/wouldn't be able to do anything as I had booked through a TA and she would need to alter flights. Cue days of emails across different time zones, including holdups on a weekend when the TA was closed, trying to change things as we received more information from home etc. It was ridiculous and extremely frustrating. In the end we didn't return home (a small part was due to it being too late to make the funeral due to all the holdups with going via the TA). The day before we were due to fly home I went online to check our flights to find that my husband was no longer on our booking. More panic.
I immediately emailed the TA (middle of night at home), but then decided to give the airline a call just in case. Success this time. Lady at VA sorted it out on the phone, followed by more emails from me to the TA telling her to ignore my previous emails/please for help. Never again!
Contrast this with the previous year. We were going to Asia for Christmas and I had booked directly on the Singapore Airlines website (fabulous airline BTW). 24 hours before departure DH decided it'd be a great idea to injure himself at work. Our flight left at 9am on a Saturday morning. Long story short, I phoned SIA and told them the situation. We were in contact throughout day (they texted me new flight options as they arose). It wasn't until midnight (only 9 hours before departure) that I was in a position to call them again and tell them the exact final situation. They were fantastic - as I was on the phone to them they rebooked DH's flights, I paid over the phone, they emailed me all the new documentation etc. 8 hours later the kids and I collapsed onto the plane and couldn't believe the previous 24 hours had happened. In this instance a TA would've been of absolutely no use to me. They wouldn't have even opened shop until the time the plane took off, which would've been a bit late for them to do anything.
For our 2015 trip to Europe I stuck to booking our flights online myself. It was a rather complicated itinerary, but I was more than happy with the price Expedia came up with. I actually doubt it would've been cheaper via a TA, and even if it was, I don't care! We did have one missed connection on that trip that was beyond our control, but the airline automatically rebooked us, so no worries there.
From now on if I find a price online that I'm happy with I'm booking it. A few saved dollars going via a TA isn't worth the stress if things go wrong.
In all my years of booking things myself I've never had an issue. That's in contrast to all the stuff ups Flight Centre and (the then) NAB Bank travel made in the days pre-internet.
It was also so frustrating not having all the flight paperwork from the TA until about six weeks before departure.
