Disney's Port Orleans Resort French Quarter is the smallest moderate on property — by a margin. The other moderates (Caribbean Beach, Coronado Springs, Riverside) all sit around 1,800–2,000 rooms; French Quarter sits at 1,008. The size delta is the entire pitch.
French Quarter is walkable end-to-end in seven minutes. The pool is one pool, in the center of the property, with the only Disney moderate water-slide that has theming worth the photograph. There is one quick-service location, one table-service via the boat to Riverside, and one bar. The decision tree at French Quarter is short, and that is its virtue.
The theme is New Orleans's French Quarter — wrought-iron balconies, gas lamps, beignets at Sassagoula Floatworks, jazz piped through the breezeways. Disney commits to the theme harder here than at any other moderate. Nothing about French Quarter feels phoned in.
Transportation is bus-only to the parks, which is the moderate-tier downside, but the boat to Disney Springs runs every 20 minutes and is one of the most pleasant resort transportation experiences on property.
My recommendation pattern: French Quarter is the right moderate for couples, for adults-only parties, for families with kids 8+ who do not need pool slides as the centerpiece, and for any guest who has already done a bigger moderate and felt overwhelmed by the footprint. Caribbean Beach is the right moderate for families with younger kids who want a Skyliner-attached resort. Riverside is the right moderate for large families who need 5-person rooms.