You can cheese Yagluth pushing yourself into the alter from below using the hoe, although it seems like it's more difficult now.

The last time I tried that, it seemed like he couldn't attack you in the alter, but I tried it once after the ML update, and it took some effort finding a spot where I wouldn't get hit, but could still hit him.

I also find the boss fights tedious. It can be fun to work on strategies and such, and the first time or two is exciting, but it gets to be just a hoop that you have to jump through.