"Ground Loop" apparently refers to current in a "ground" or reference conductor, causing voltage offset that upsets logic levels or introduces analog noise.
en.wikipedia.org
"Ground" as reference in a circuit can be a single wire, a plane (sheet of metal), or a mesh. Something like chicken wire or window screen could serve as a mesh ground plane. So long as openings in a mesh are small compared to wavelength it behaves similar to a continuous plane. At 1 GHz, wavelength is about 6" or 12" depending on dielectric. "loops" 0.5" across are approximately same as a continuous sheet (but measurably somewhat different.) Lower frequency, closer to a continuous plane. At 60 Hz, wavelength is 3000 miles, the width of the United States. Any "loop" in house wiring ground is a very fine mesh.
Loops formed in the electrical grounding conductor of house wiring isn't such a problem. Absent high current (e.g. short from line, or use as return path instead of neutral), voltage drop across ground is insignificant. Even used in place of neutral (e.g. 3rd pin of older clothes dryers, carrying return current of 120V motor), no significant voltage drop unless there is a bad connection in ground. (I don't like that dryer connection, because open ground makes chassis hot, 120V. I've installed 4-pin outlet and GFCI.)
Whether ground wires in your house form a star (typical fan-out of circuit from main panel to sub panels to outlets), or are connected together in a loop, there isn't likely to be any problem. Maybe if a 10kW furnace had its ground also connected to an electrical outlet's ground and had a short from L1 to ground, one wire could carry excessive current briefly before breaker tripped.
What a loop formed by ground connections will do is catch 60 Hz magnetic fields from the air and turn them into current, which then presents a magnetic field wherever the wire is routed. We're measuring and fixing that for some sensitive instruments. Just a loop of wire in the air will pick up a few mA, not something that would normally concern anyone. A metal enclosure around a transformer can carry 1A due to leaking magnetic field of transformer, but at about 1 mV when measured open circuit. Neither case is something normal humans care about (only some sensitive equipment.)
For that case of wires including ground inside metal conduit also ground, that's like forming coax. What small loop area exists between wire and conduit gets cancelled by area between wire and other wall of conduit. Pretty much zero (differential) voltage and current induced.
"Ground loop" would matter to you if RS-232 used to send signals between equipment, because ground wire in cable might also go to chassis, not be isolated. Induced currents could cause data errors. RS-485 uses differential signaling, able to tolerate a few volts. Ethernet is galvanically isolated and transformer coupled, so virtually immune to voltage differences in ground.