IMHO, there are two different parts to yeshivish. The first one is halachic yeshish; spending excessive time learning, keeping many chumros, etc. Not only don’t I see anything wrong with this, but it think it’s a very good an praiseworthy thing.
Then there’s the culutral yeshivish; a certain mode of speech, dress, etc. While I do not see anything wrong with this, I can understand why some people might not like it in excess.