Reflection in low frequency conductors (not transmission line)
The equation shown below describes the input impedance to a transmission line in terms of length, terminating impedance and characteristic impedance: -

So, if \$\ell\$ is zero then: -
$$Z_{IN} = Z_L$$
Do the math, plug some numbers in.
And of course for very long lines, any reflections are more highly attenuated by the return journey to the source so it's not usually a big deal except in power AC analysis.
So, as the line extends from zero length it starts to alter the impedance presented to the source but, for short lines and long wavelength this is pretty much all that it manifests as; it just looks like a slightly odd-ball impedance.