Hello Mike,
re-sizing is indeed not necessary any more for this forum, however, it does reduce upload times. On Windows there is a free tool called Prish-resizer, which gives you a right-click option for photos. So you can click 5 photos with ctrl key and then right click and choose "resize". You can configure your standard size, and if you want to give the smaller ones new names and/or put them into a separate folder (my choice).
On Mac you can build something similar with automator.
And then there is always Gimp, a fully-fledged, free image processing software, with similar power as photoshop, but less intuitive to use.
Kai.