I know that most of the applications I develop are in .NET and my OS is Windows 7, and I love Visual Studio, but I hate IE !
In the project we are currently working, we have encountered lots of issues in UI aspect of web application in IE. From simple sliders to responsive tabs and etc… You may say that in newer versions of IE there has been lots of enhancements, but the fact is that most of IE users have not upgraded to recent versions.
The lacks and weakness of this browser has caused to lost market share of browsers to 14 %, whereas it was the first one three years ago.
Anyway the business owner claims that most of his application visitors use IE as their browser! and our team have to make the app accessible in all browsers .