Just to throw some interesting numbers out there, because I feel like it...
Currently in explorable surface area estimates of planet surface sizes (which we can currently land on), not including traveling in three dimensions in space otherwise, Elite Dangerous Horizons is about 1.90448313076*10^22 times larger than the overworld in a Minecraft game. The Minecraft surface area purportedly being so large that it is "infinite." Of course most people have no conceptual idea of what infinite really means, so they toss it around as something that is extremely big, when in reality it means without end – this is why 0.999... is mathematically equal to 1, for example. But I digress...
Makes me wonder how much "larger" this game will be once we get to land on all the worlds. Last I heard, rough estimates are that we can currently land on about 60% of worlds. Gas giants are typically much larger than rocky worlds though, of course, so assuming we include being able to fly through their clouds in these numbers, that 60% doesn't necessarily have all that much weight.