Personally it seems more like a liberal media is more likely to point out when republicans do it, ultimately giving the impression that you seem to have.
The both do it wherever and whenever possible. Under current laws, they'd actually be stupid not to.
However, what I'd like to see is a computer algortihm based redistricting that is approved by all parties. The rule of thumb when you cut a cake is that the person who cuts it chooses last... that ensures they make the fairest cuts. Unfortunately you can't apply the same logic here, but you can make it so everyone has to agree... the only way they'd agree is if it were fair.
Then again, I'd like to see instant run off implemented at all levels, including choosing electors in presidential elections... and I'll never see that, either.