I can SO identify with this thread!
Sometimes I worry that I don't DO enough my my ds. He's a lovely, happy contented child who is very self contained and happy to occupy himself, to which I think "great, I can get on with other things!" Sometimes I worry that I don't do enough to stimulate him - but he seems to developing well enough exploring on his own. I wonder if modern society is putting too many expectations onto us! How much time did mothers in olden days spend with their children? They'd have probably been out working in the fields or where ever, with the children playing at their feet or beinbg looked after by their older siblings!
I went back to work f/t when ds was 4 months - and didn't have a single qualm about doing so. I enjoyed my time "off", but I also looked forward to the company at work (it got lonely at home!) The childminder lives literally next door (and with her mother and MIL working with her it is more like a cross with a nursery) and is vastly more experienced than me, so I can always ask her for advice. I enjoy my work - and I enjoy getting home in the evening and spending that time with him.
Ds is now 14 months old - and it's right, the bond does develop more as your baby develops more personality. He's now changing and developing so fast and starting to interact so much more with us, it's a pleasure to get home every night.
Dh and I have always been relaxed about leaving ds with other people - in fact, advice from my best friend (a GP and mother of 4) was to go out when the baby was less than 2 weeks old, to prove that it is possible! We also went off on a 2nd skiing holiday without him when he was only 6 months old (we'd used a nanny service for the first one, just before I went back to work) - dh had injured himself on the first holiday and was desperate for his skiing "fix" and it did us good to have time together.
I also b/f for much longer than anyone I knew - I fully b/f for a full year and have only just (sniff!) stopped the morning and evening feeds (a good stock of EBM and lots of expressing while I was away skiing!)
Dh and I have a theory that if you have kids later (I'm now 40, he's 42), you can go one of two ways - either ultra relaxed or ultra paranoid, and we've gone the former route! We also say that ds made it easy for us as he is such a contented baby - but my parents' view is that it is our relaxed approach that has contributed to him being such an easy baby.
Like you Worried, I don't see him as my only priority - but he is extremely important. Dh is also important - as is our relationship - and as am I! I also don't run to him every time he cries - and I'm sure it's no coincidence that he's slept through from a very early age (he goes down at 8 and we get him up at 6.45 - he even sleeps longer at weekends)
There's no absolute was of quantifying what amount of love is "enough" - and that is because everyone's love is unique, so it is not posssible to quantify it! Your love is "enough", because that is the love that YOU experience. It's neither right nor wrong, nor too little or too much. It just IS. Just enjoy the love you do feel for your wee boy - and don't spoil the feeling by worrying!