I think this is an interesting topic and something I can relate to. Being a male, I can't really compare if it is easier to be social as a female than male being solo at Disney but I do think there are factors that can make it easier for a guy.
Some background first. I am almost 39 but people normally guess late 20's/early 30's. I am also very "pooh sized" i.e. overweight with a light beard. I'm told I'm like a big teddy bear. Speaking of being referred to as a bear, I am also gay. Although DisneyWorld is closer, I go to
Disneyland much more often. I have only been to WDW once (second trip is later this month) but have been to DL many times.
I love solo trips! My only WDW trip back in 2009 was a solo trip. With Disneyland, I have done both solo and with friends. Usually it is me solo during the day and during the week and local friends tend to meet me in the evenings and/or weekends. I have a DL annual pass so I often just go for a few hours on some days out there. My upcoming WDW trip will be a mix of both. I am meeting friends for gay days/star wars weekend and some bear events on May 31st for a 4 day weekend. I've decided to arrive in Orlando on Memorial Day and stay at All Stars Movie resort and have 3 days of solo touring. That way, I can go to what park I want to, ride what I want when I want, eat when and where I want and rest all the time I need. When I meet up with friends later in the week, it will more of a social event. Because I've already done what I want, I can be more go with the flow.
Here is why I think my solo visits have been successful:
1. I think Disneyland resort is a better resort for solo travelers than WDW. Disneyland has many more locals than WDW and many of these locals are solo in the parks. They are just popping in before or after work or on their day off. I would say 75% of all my social interactions on solo trips have been with solo locals. They seem very helpful on getting you to the right place or giving tips. I think they are much more likely to notice something like an unusual pin or lanyard or something else you are wearing and strike up a conversation. This is their home away from home. They are not ride commandos or feel they need to get every last dollar worth from their admission. They have annual passes and can go anytime so I think they are much more relaxed than people at WDW.
2. Although I do not wear any kind of indication that I am gay (except red at gay day events), I think gaydar does exist especially with women and they don't perceive me as hitting on them or anything and have often been very friendly to me in the parks.
3. I think it does help to always have a smile and be outgoing regardless of your sex. Look like you are always having a good time and happy to be there. Engage people. Don't be afraid to start a conversation. I almost always get a good response. For example, last year I was at Disneyland on a Sunday evening with friends. They left at sunset and I stayed at the park (I LOVE Disneyland at night). I was tired and was waiting for the train at the Tomorrowland station. This college aged girl comes up behind me in line. She is alone and seemed frustrated. I told her "Smile. You are at the happiest place on Earth!" then I paused and added "And remember that next month when you get your credit card bill". She laughed and we started talking. Apparently she had a fight with her boyfriend. We continued talking on board the train and did an entire loop. She did most of the talking and I listened mostly. I told her I was getting off at New Orleans Square to ride Haunted Mansion and she said she would ride it too. We also ended up watching most of Fantasmic together before it was time to call it a night. She gave me her phone number when she left but I lost it. I don't know if she knew I was gay or was interested in me but I like to chalk it up as she just needed someone to talk to that evening and that's all I took from it.
I have also heard you should wear something of some kind of personal matter that might make people strike up a conversation. Like I'm from Kentucky and a solo person from here might want to wear a UK tee or hat (please don't over do it though like most people here. Ugh). They just won the NCAA championship, so a college basketball fan or someone from Kentucky might strike up a conversation with you. A doorman let me skip the cover charge at a club in LA once when he saw my Kentucky ID. I wasn't alone but we talked for awhile about how he was from Louisville and how he sometimes missed "back home". Give people a reason to talk to you.