I've never touched them! I always found that if I do, it inhibits my city's food reserves.
I feel like I might be missing out on a valuable tactic.
Am I?
Yes.
Some tiles are very valuable and you want to work them if you can. Most resources are exceptionally good to work when they have the appropriate improvement and you'll want to work cottages if you can, as well. Cottages are an awful improvement, but they turn into quite good improvements over time.
Most of the time, you'll get better output from a good tile than from a specialist. Compare a Plains Forest to an Engineer and you'll see that you get 2
from the Engineer while you get 2
and a
from the Plains Forest. Obviously, the Plains Forest is a better tile to work.
Or is it? You have a limited amount of happy people available to a city. putting some of your citizens to work as specialists instead of working tiles that produce food will limit your population growth. While that is a bad thing if you want to grow, it's a very good thing if you are near the edge of your happiness limit.
Additionally, each specialist grants you 3 Great People points per turn. Great People are an exceptionally powerful asset and it is a shame to miss out on them. Even people who base their economy on Towns and Cottages still try to keep at least one city with good food resources focused on creating Great People by working only food tiles and specialists and ignoring all else except for what is absolutely essential in that "Great Person Farm" city.
It is also entirely possible to create a strong and dynamic economy by using lots of specialists to satisfy your research and $ needs.
I've done both and I've found that neither approach is absolutely better than the other. Each has its strengths and its weaknesses and each is better suited to different leaders and different particular maps.