Holy c**p ladies! Where on earth have you been having your babies?! It makes me sad to think people are having these experiences.
OP it depends on how you think you will cope without anyone there. The midwives should help you out when you buzz. They should help with passing baby to you, nappy changes, feeding assistance, wrapping and settling baby PLUS be doing frequent checks on you. Depending on what time you have your CS will depend on how often they are doing your obs, checking your wound/blood loss and changing pads etc. We try and answer buzzers within 20mins. We can't always answer them immediately if we're helping another woman, but if your midwife is tied up then one of the other midwives on shift should be able to answer your buzzers. Over night they should be able to respond relatively quickly as people are sleeping (hopefully) or at least not all waking and requiring help at the same time! You should be ok if you have good midwives! In regards to pain relief, buzz the moment you start feeling sore. That way if it does take a little bit of time you're not waiting in agony, plus it is far easier to control your pain if you have something when it first starts to hurt than when you're in 10/10 pain and distressed.
Be mindful that not every hospital has a nursery you can send your baby to. If they have the BFHI (baby friendly hospital initiative) accreditation (or working towards it) then the only nursery they will have is special care for unwell babies. They may have people on shift who can help you out with bubs (nappies, settling, wrapping etc) if the help you need is non clinical.
And if you ever experience care you perceive to be sub-par, tell someone! Ask to speak to the unit manager while you're an inpatient or the patient representative once you're discharged. If there are bad practices going on, they can't be changed unless it's known that they're happening.