I use grads all the time, and I also make extensive use of graduated filters Lightroom (I'm guessing 75% of my final images have at least one graduated filter) as well as other techniques in Photoshop. With Graduated filters I even sometimes bracket, and then using layers and masks in Photoshop to compensate for areas above the "skyline".
Their are circumstances where capturing the sky and foreground with a different shutter speed or f stop just doesn't look as good as using a graduated filter. I've shot things both ways and I do it both ways, but there really is something magic about a seascape using a couple of grads on the sky so the clouds blur like the water.
My most common used filters are Lee .6 soft and hard as well as a .9 soft and hard. I'm not sure I've ever used the .3. Often if I use the .6 or .9 I end up with a graduated filter in Lightroom as well. I also frequently use two graduated filters stacked, usually a .9 hard and a .6 soft adjusting first the soft grad, then adding the hard grad.
If you are interested here
are several examples of images of mine that use either graduated filters or Lightroom to balance the sky and foreground. About 1/3rd of these images have been taken using grads, the other's all adjusted in Lightroom. Only a couple are exposure stacks, with my Medium format system I usually have plenty of dynamic range to get a good image just using the graduated filter tool in LR.