'Dry load' for a small signal switch means switching a voltage of less than 1mV and a power of less than 1µVA. In the example of Michael, where a pull-up of 1kOhm is used at Vcc = 5V, in the moment of switching the potential across the contatcs collapses from 5V to about 0V. So, there's a brief period of time, where a power of (Vcc / 2)^2 / R = 2.5V^2 / 1000 Ohm = 6.25mW drops across the contacts. When using a pull-up of 100kOhm only 0.0625mW would drop!
So, for me it's justified to say, that using a pull-up if 1kOhm will help to avoid dry switching, whereas the use of 100kOhm pull-up will not. This is also prooved by reality: Using a pull-up in the kOhm range gives much more reliable results in combination with a small signal switch, than using a pull-up of about 100kOhm. Especially if the contacts are getting older and older!
Even a switch consisting of gold contacts will benefit from using a rather strong pull-up.

Kai