For popular music Shoshana Bean, Gavin Creel, Lea Michele, and Laura Bell Bundy are the only ones who make anything bearable to me.
If you like sopranos then Kate Baldwin, Liz Callaway, Kelli O'Hara, Rebecca Luker, Melissa Errico, Kristin Chenoweth, etc.
For guys, Brian Stokes Mitchell, Cheyenne Jackson, Billy Porter, and Leslie Odom Jr.
Standards and anything "jazzy" is hit or miss. I like Ana Gasteyer but you've really got to listen around and decide for yourself. I think a lot of those efforts come across as lazy considering what their voices are capable of. Not naming names.
Then there are the obvious ones... Patti, Liza, Barbra, etc.