Same. I use SW combined with Miktex. I am way faster working through derivations in SW. When I have the real work done, I clean everything up with a real latex editor
The problem is the lack of updates of 5.5. The program starts to get compatibility issues, especially with video. I like SWP for the math, but I am using less and less. And there is no substitute for the math. LyX is slow to make calculations.
To typeset, it is better to use overleaf or other editing programs. SWP survives because it is very efficient in displaying equations with shortcut keys. It is good for the calculations. Substitutes have not appeared yet.