My 2 cents.
My first "large" boat was a Catalina 27 fiberglass sailboat which I bought at an impound auction and totally refit and upgraded, inside and out. The exterior f/g and nonskid repairs took a long time. The boat had some deep "piling rashes." The fairing and gelcoat matching and polishing was time consuming and kind of an art, but it was satisfying and the boat turned out great.
Our current boat is a wood 1971 Grand Banks. And as others have said, they have to be maintained. We bought this boat because I wanted a wood boat, and the hull has perfect. I have almost all the maint records and have talked to 2 of the 3 previous owners. The hull is all original wood. I, like the previous owners kept it in a boathouse, and recently under cover. You have to keep up with the paint, which is pretty easy, and rebed, which is easy. The worst is the acreage of varnished teak. But that would be the same on any boat with exterior teak. For me the most maintenance is the old Cat diesel and systems. Most wood boats tend to be old and so are their systems.
I looked and many wood boats before buying ours and almost bit on a free boat. But as some wise old timer told me; "The most expensive boat you can get is a free one."
Also since wood boats often cost less, their owners often don't put the money into them like they should. When looking, look for "Home Depot" quality materials, they are often a giveaway to cutting corners to save a few pennies. This is true regardless of hull material.
Good luck, if you are in the PNW give me a call I can show you a wood boat. I have an extra paintbrush. And to answer the original question about how much work, I'm too biased to answer that, but my wife would probably say the wood boat is a bit more work, or maybe I just spend more time on the wood boat...
PS
For maintenance and repairs, as Marin says the GB board is great, as is Wooden Boat forum, and the Wooden Boat series of 3 books are priceless
-Bill