Cable Needles are our friends!
I often teach friends and neighbors to knit. Invariably they show up with a ball of worsted weight yarn and 2 ridiculously long straight needles. One of my first recommendations I make if I think they will stick with knitting is to invest in a set of interchangeable cable needles. But even if they are unwilling to take that step, I encourage my students to use cable needles as their default needles as opposed to straight needles. My reasons are thus:
1) Multipurpose. You can only knit straight on straight needles, while you can knit straight and in the round with cable needles. This means you can change needles less if you have a project that jumps from knitting in the round to straight and back again.
2) Weight distribution. Even when working straight on cable needles it is gentler on your wrists because the flexible cables allow knitters to rest most of the weight of a project in their laps or on a table in front of them. This is a good option of those with weak muscles, arthritis or people just getting in the game who haven't built up their knitter's bulk yet.
3) Odd jobs. Cable needles can serve as stitch holders, can be used in provisional cast-ons and other odd jobs that straight needles can't even dream off.
4) Lighter. Though not terribly so, over many hours the lighter weight of cable needles over straight needles can reduce fatigue, muscle strain and can speed up your project.
But how do you knit straight on cable needles? Easy, it is just like have a string tied to each end of your straight needles. You knit from your left needle to your right and once you get to the end of a row (this is easy to tell) switch your left needle to your right hand and vice versa for the other needle and start your next row. It is easier done than said and will really open your eye, expand your project load and reduce your needle inventory. You can start with one and go from there. I would encourage you as I do my students to invest in an interchangeable needle set; it is worth its weight in yarn!