Disguise Self should just be removed it's imersion breaking and way tooo much work for little gain. But hey that just my opinion.
I really like Disguise Self, and I think it is very useful, too. You get new options too solve a problem, and you can avoid a lot of fights.
Disguising as a Drow, for example, makes it very easy whenever you interact with the Goblins, you do not even have to use the tadpole powers.
I like to play more "tricky" characters, for example a sorcerer with the charlatan background, and I use this spell quite often.