Laps can be a huge help. Firstly they allow the Doc to map all the locations.
The surgeon can cut back the adhesions freeing up the organs that have stuck together so hopefully they can work better - ie the bowel and bladder.
Any cysts can be removed giving a great deal of relief from pain.
Endo lesions which are removed and hopefully many will be, are no longer able to shed their linings and bleed each month causing pain when that blood irritates other places because it is trapped and cannot escape. That's what causes pain endo pain and sets off adhesions to grow. adhesions can cause pain too and restict function of things.
Barriers can be put in place to protect organs from adhesions sticking them next to other essential organs.
Stents can be put in to keep the tubes that run from the kidneys to the bladder, working as tubes and not getting squashed so they no longer work.
If you are not familiar with how endo and adhesions work and what they can do then its not surprising you are not aware of how much good can come from surgery to preserve the function of organs and also in many cases preserve your fertility too.
Any endo or adhesions on or around the ovaries or fallopian tubes threatens to stop any ova from reaching the uterus and stopping any chnce of a natural conception.
The blood will eventually be reabsorbed back in to the body - but not before it has irritated other tissues and caused damage. And by the time it does that you are on your next period repeating the process. Think about a bruise - it bleeds in the skin, then over several days or weeks changes colours as the body is reabsorbing the blood back eventually the skin returns to its normal colour but it never happens overnight.
It is essential therefore that after any lap you take steps to stop the monthly bleeding by using BC pill packets back to back or the mirena coil - which reduce the number of periods you have each year and reduces the chance of new endo spreading from the shedding of endo cells with that period blood from travelling along the fallopian tubes and in to the tummy to nest wherever it wants to.
I would suggest you take some time in your post op recovery break to read up online all you can about the female human anatomy and endo and adhesions.
there are so many websites about this and the benefits of surgery on endo and adhesions.
It doesn't cure you from having endo or the chance that new endo will grow some time in the future - but to stop old endo and get rid of it is absolutely the best solution we have at the present time. Infact it is the only solution we have.
Everything else in terms of treatment is to reduce new endo from having a chance to take hold.