Do switching regulators usually require a lot of external components?
Switching regulator components are sold in several configurations.

A switching regulator controller is an IC contains the control functions, and perhaps a gate-driver boost circuit. But it will require external inductors, external switching components (FETs), external capacitors, feedback resistors, etc.

A switching regulator IC often integrates the switching components (FETs) with the regulator controller. But it will still require an external inductor and capacitors.

A switching regulator module is typically a complete circuit with multiple components mounted on a small PCB. It usually includes an IC, inductor, some capacitors, etc. This can be a nearly complete solution in a single orderable part number.

Using a modular solution is a good idea when you do not want to devote resources to designing the regulator circuit, and when you can find a existing product that meets your needs.

A regulator IC is a good idea when you want more flexibility to tune the design to your requirements and can't find a modular solution that meets your needs. Cost might also be lower than for a modular solution.

A controller IC often allows handling higher load currents than an integrated regulator IC because the switches can be larger and not as much thermally coupled to each other and the rest of the circuit.