So my Catalina 30 came with a traveler like you describe - pins on the car, pull em up to move the car. It was curved too. It was an absolutely useless piece of hardware.
A few $$ to Garhauer and I was much happier. (I actually got the entire C-30 upgrade with a traveler, rigid vang, all new mainsheet and blocks, new jib cars, etc.. It was a bargain for how much better it made the boat.)
I use the traveler a lot. It's my primary main control now, except when pretty far downwind. Even tho I'm a cruiser, it's sure nice to be able to dump the main in a hurry, tweak it for twist by using the sheet and traveler, etc. It's soooo much easier. You may think about an upgrade after you try using the one you have for a while.