All of the "orbits" or pseudo-orbits at the Lagrange points are within a very large volume. At the Sun-Earth L1 and L2 points the typical orbit is a halo orbit or a Lissajous orbit which loops around the Lagrange point at a distance of typically a few hundred thousand kilometers (on a similar scale to the Earth-Moon distance). In a practical sense the volume available for spacecraft to use the points is so enormous that we are unlikely to run into any crowding constraints any time soon.